For Nalgenes, hit eBay. The polycarb labware is the same stuff as the hiker's gear, just not as pretty. And you can find lots of custom one quarts that have errors in the printing dirt cheap- they might not be as spiffy, but when it's real world, who cares?

Stealth mentioned lifeboat rations. They work, but I might suggest adding a bottle of appetite suppressants to your pack if you do. They aren't filling, and when people are hungry, the can get grumpy and make decisions based on that.