Product review (5 stars): Best electrolyte replacement on the market - accept no substitutes
If you wander around in the dirt in hot, dry weather (i.e., Southern Arizona) or do a lot of gardening in Wisconsin on hot days this is the stuff to use.  Forget the commercial junk sold on TV - it's loaded with sodium and glucose - useless if your body is needing real mineral supplements, primarily potassium.

A quart (or gallon - if you need it!) of this stuff will set you up a lot better than anything I know.

Vitalyte used to be marketed by an Australian company as Gookinaid and we used it when we hiked the American Southwest 20-30 years ago - Grand Canyon (not the touristy part), Grand Gulch, Sangre de Cristo range, southern Colorado and many places in between.  This stuff was our lifeblood on a 20 mile day or when climbing a 14teener.  Back then we called it 'gook' and still do.  Old habits are hard to break.

It consists of a combination of minerals and dextrose - some sodium, plenty of potassium (you NEED that) and other stuff.  Doesn't taste like something coming out of a vending machine and lasts several days unless overheated.  Beware - It CAN get funky - so be careful with your water bag/container - a tiny bit of bleach helps.  This is true of any electrolyte drink, not just Vitalyte, so I don't mean this as a criticism.

My son, for twenty years plus a professional archaeologist in Tucson, buys Vitalyte by the case and feeds his ten plus person crews on it (they mix up  five gallon insulated containers before going out on a project) - I guess he learned something from the old folks.  They walked across New Mexico from the Texas line to the Arizona line and used up about 20 cases of the stuff - nobody had heatstroke or came down with electrolyte problems.  His competitors crews uses the other stuff as advertised on TV and required several helicopter drag-outs. Potassium is important - it is the life-or-death mineral in your system when you are sweating heavily.  Low potassium can cause sudden death - not something to mess with.  Vitalyte, as opposed to other electrolyte replacement mixes (as advertised on TV) has enough potassium to keep you going..  Get Vitalyte and use it - you won't regret it.