Here is a great article about using CaCl2 for exotherm, you could use prestone deice liquid, or maybe another brand, 1/3 cup to 1-2 cups of water for a cooked meal in a ziplock or other canteen!

Here is the post.

Air-Wash with negative ions is an old technology, Godrej had one and I remember older ones too.

Now a bunch of kids in Singapore reinvented a negative ion based washer, not needing a robot to do your clothing, just keep dumping your clothes into one and it senses the VOC molecules and sanitizes with an Air-Wash asynchronously!

I saw this negative ion generator on Amazon.

Specs are ” Performance Ion density: 1.9 trillion ions/cc at 2.9 cm from emitter Ion output: 12 trillion ions/second Ion output voltage: -9500V Coverage: 200 square feet based on HVAC installation Particle effectiveness: as small as .01 micron Power use: less than 1 watts Power requirements: 12 VDC Please use extreme caution when working with this item and do not purchase this if you are not knowledgeable of high voltage safety precautions.”

All you need is a 12 volt 1 watt fuel cell and you need to optionally circulate the air in your wash bag!

There are ready solutions using a cooling or any other fan for that!

Otherwise, there is an ultrasound washer available on Amazon.

I found this 350 Watt, 2 pound drier on Amazon, it can dry three or more clothes at a time, with the ion generator, I am sure it can air-wash effectively too, failing which you could use a handheld ultrasound cleaner too.

Additive manufacturing is green and a economical alternative for custom designs. In this Dojo, we explore a chip-chap beacon using a NE555 timer for 433MHz pulsing to be detected by an AMSAT CubeSat.

An automated PCB layout is generated using Eagle PCB maker and SMD capacitors and resistors are ordered, an SMD NE555 or DIP package can be ordered too.

We can order a PCB online and use graphene based conductive adhesive to glue the components or we can try out the brave new flex manifold design.

For this we use a normal PLA printer and print the housing manifold and glue flexible copper tape on it. Then we calibrate a laser etcher to etch the PCB pattern, removing the excess copper off and glue the components using graphene adhesive.

If you still are an additive purist, you could try a copper-resin FFF or SLA printer to print on the PLA manifold and then stick the components.

If you are more adventurous, you can download a schematic for the 555 timer in OFET and design a layout for graphene FFF or SLA printing, you can start with resistors and capacitors which are a lot easier.

References:

Printed Electronics

Towards flexible all-carbon electronics: Flexible organic field-effect transistors and inverter circuits using solution-processed all-graphene source/drain/gate electrodes

Radio Fox Hunting resupply can be fun on a backpacking trip, apart from traditional passive radar based tracking, GPS based tracking can be double the fun, if 6G SigFox or Lora is available to register the GPS coordinates on geocaching.com

Even a simple amateur radio satellite can be used to beam the GPS coordinates.

We consider the following design, abstract submitted to Dan Schultz at n8fgv@amsat.org for the AMSAT 2019 conference.

Locating a iBeacon with GPS, using amateur radio VHF and the AMSAT satellite PSAT, NO-84, cubesat, using AX.25.

Resupply by airdropping or drone-shipping is a new resupply strategy in backpacking. In preparation for reconnaissance in long distance backpacking and SAR activities in remote areas, with little or no development, we consider the use of amateur radio with GPS beacons for resupply tracking and geo-tagging.

While 6G communications using GPS satellites are available for mountaineering beacons, we use a dual strategy with an additional amateur radio based AX.25 packet radio using the PSAT based cubesat for publishing location information.

In this Dojo where $count is probably 3 or something, I lost count, I am concentrating on avoiding the county roads that run under the freeways, post-offices, etc. While I am still experimenting with the proper resupply strategies and how to avoid county roads, much like light aircraft fliers, I am often lost in back country, since GIS is of little use and maps useless, we need geocaches, earth caches, beacons and air-dropped caches fro resupplies. Also we need a trail angel circle.

In this Dojo, we are going to explore two beacon designs, a simple 555 based HF beacon and an BLE iBeacon.

Here is a circuit I picked up from the web, designed by T.K. HAREENDRAN, a hobbyist.

The Beacons Schematics.

We can modify the component values for HF, 457 KHz.

Also if you browse mouser or arrow’s component list a ready iBeacon module is available for sub $10. All you need is a good solar garden lamp and you can wire the iBeacon to it.

You need to desolder the LED and connect a DC to DC converter directly to the 555 based beacon or the iBeacon circuit.

If you cannot hack low cost products, you can easily buy a solar panel, some super-lattice LiPos, a charge management ASIC and power the beacons.

Here is another article I fished out for a 433 MHz Beacon for air dropped resupply.

the heading is : 433 MHz UHF Lost Model Radio Beacon

Essentially, if you love radio fox hunting as part of the back packing experience, you can yagi down the resupply beacon. There is a simple sniffer radio on this site and you are free to use a vintage yagi or still better a passive radar with down converter or frequency scanner, all with a simple GNU based software radio. There are good GNUs and bad GNUs!.

Dogomonno found an interesting piece of Earth History, of a species, kept ignorant of dreams, sleep and death.

Earth of the transient species, the species who invented electromagnetic pollution, unlike the peace tribes, had the saddest history of self annihilation. They were a species buried in insecurity and mistrust. They had an arms race of self annihilating armament, nuclear weapons were only the beginning. Denied flight, the cost of flight and space faring was sleep and dreams, when they figured out the meaning of sleep, dreams and death, they designed a devastating weapon, the sleep weapon, whole cities just slept off into dreams in subterranean realms, they just woke up in a dream, a reality away from the surface.

Finally someone used the weapon on all remaining earthlings who pollute, nearly all such humans disappeared somewhere subterranean, and the surface was peaceful again for flora and fauna and the peace tribes, who lived again naturally, to this day.

Wilderness Survival Episode II, IOT and the Wick Sage.

Wick Sage – Water Condenser

With IOT to monitor the water collected.

Given the remote location, LTE or Sigfox/Lora IOT is used to check the amount of water collected. We need any LTE or Radio IOT board and a water level monitor.

Active Condensers, an open design using peltiers from SunGlacier

An added improvement is to add wicks , one or more below the air intake manifold.

Putty is the mascot of the circular economy, in this spirit we add the following hacks:

recycling used dry cells:

Hack: disassemble the dry cell to extract the zinc or other metal and the electrolyte paste. The metal can directly be used as anode of the metal air fuel cell and the electrolyte paste dissolved in alcohol and sprayed on the carbon paper for improving the efficiency of the fuel cell. The viscosity of the electrolyte should be low enough for gas diffusion, it works as a catalyst for improving recombination efficiency and for metal ion diffusion.

recycling waste plastic as fuel:

Waste plastic can be dissolved in acetone and used with the appropriate enzyme in a hydrogen fuel cell.

More on the enzyme and platinum carbon cloth later.

recycling waste paper and cardboard as fuel:

To make paper pellets for winter and cooking use.

recycling waste vegetable oil of WVO:

With an enzyme in fuel cells, directly in fuel tanks with a converter for octane or cetane and as a fuel with waste paper pellets in the DIY BioLite.

recycling empty beer cans and other cans:

To make a DIY BioLite and as fuel in a metal-air fuel cell.

recycling empty PET bottles:

to make beautiful RPET fabric and wool. More about this later.