Now this is the kind of "water reservoir" I'm talking about. The ultimate in hiking hydration, or portable happy hour, the ManCan is a personal keg system complete with a stainless steel keg, 2-stage Regulator System, Flex Hose Tap, and whichever cold, fresh beer you want to fill it with.
ManCans come in 128- and 64-ounce vessels mancan.beer (can I make a web address that's feed.me.beer?) says are indestructible, and can be packed, or packmuled to take anywhere. The company sells 2 primary kits, the ManCan 128 Flex Kit and the ManCan 128 Machismo Kit.
Flex Kits include the gallon-strong ManCan, plus its attachable pour-anywhere tap and flexible hose for flexible serving--over the shoulder, under the arm, or just right out of the fridge. The kit also comes with a stainless steel no-leak cap, 2 x CO2 cartridges, and cleaning tablets.
Machismo Kits increase the ManCan quality to 304 stainless steel, and add a professional-grade tap.