Emergen-C is an excellent re-hydrator. My daughter works in a health food store, and tells me that many of their customers buy it mostly for its re-hydration/balancing qualities. One customer, who must wear a HazMat protective suit as part of his job, uses it as a restorative, and Emergen-C is a strict part of his routine. It is electrolyte balanced, each packet contains 200 mg of potassium (6% daily value) and you can safely take two packets at a time.
There are 32 minerals and vitamins, including 1000 mg of vitamin C (1111% daily value). I'm not sure about the benefits of such massive doses of vitamin C, but we all swear that it can pretty much also stop an oncoming cold in its tracks.
BTW, it is also very pleasant tasting. It comes in several flavors and is slightly carbonated. It comes in packets that you would add to water or juice, and it's easy to carry with you. Health food stores, drug stores and even some grocery stores routinely carry it.
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