I carry the envelope size ( approx.) foil water packets. I buy mine @ Mainstay, makers of the survival rations. They happen to be located in my nieghborhood. I rotate (use) them fairly often. Needing an aspirin with out a drinking fountain in sight is a good excuse. These are hardly a sufficient ration, but for taking meds, wetting your whistle ( to blow the real one) or even the psychological placebo effect are valuable.