Camelback for the Outback

My wife came into possession of a large, stainless steel tank on fine day it seems. 50 gallons and well made. Later, she found herself tending a small garden at a location without power, water and no way to collect rain from the roof. That tank reared it's ugly head...

I had actually started with an electric system. It had a small, drill-powered pump and plugged  into her cigarette lighter plug. It was even remote control, I kid you not, and could be switched on and off via a small, hand-held transmitter. Alas, with all of its coolness (and the fact that I spent all morning soldering together the transmitter and receiver circuits) it didn't have a shred of power in the water pressure category. On to air power...

The idea here is quite simple, pressurize the tank and water will spit out. And that is just what it does --perfectly. Kari can carry 25 gallons (1/2 tank) of water and it can be dispensed as fast as 3 gal/min. After much trial and error, I have found the minimum pressure (and correct ratio of water and airspace in the tank) to be as safe as possible but still be able to dispense all 25 gals at good pressure.

Now, when getting pulled over, this might be a bit hard to explain...