Just the salt/sugar thing should be Ok - that's the basis of Diaralyte (sp?) that stuff they give you when you're dehydrated from throwing up or diarrhea or something. I had it when I had gastroentertitis and threw up and had the runs constantly for 24 hours, leaving me in a right old state. Funnily enough, after that, I had this INTENSE craving for Fanta and full-sugar Coke and had about six cans in a short period and felt massively better after drinking them.