Ziploc water container in the newer issue MRE's. Put 16 oz water in one and drop-tested it on kitchen tile (never said I was a genius!) from about seven feet--end result, not one drop spilled.

Does anyone know of a source for these? Or something similar?
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Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, a critter that can be killed but can't be tamed. --Robert A. Heinlein