I took 6 of those foil 125ml emergency drinking water packets, and stuffed them in a large-mouth 32oz Nalgene bottle.
Threw in a bottle of iodine tabs, a spark-lite, matches, a white bandana, and have it all stored in a oilcamp space-saver cup in a mesh pouch from REI.
In another bottle I have two more pouches of water, two mylar blankets, Tacoma SAR tube tent, flat roll of duct tape, a few 2X2's, a few razor blades, a white bandanna, a few zip ties, matches/spark-lite, a pencil/some sheets of paper, combination whistle/compass/magnifing glass, and a zipka headlamp. Also in a oilcamp space-saver cup in a mesh pouch from REI.
These are in a backpack at work with a small first aid kit, a few cravats, change of clothes, Marmot PreCip jacket, boots, dust mask, goggles, leather gloves, SureFire G2, Petzl Duo, and two MRE's.
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--- If everything seems to be going well, you have obviously overlooked something ---