If I get dehydrated, water alone will not re-hydrate me (even if I can keep it down, which isn't always) - I MUST replace electrolytes.
You mean I'm not the only one? It really does make me feel better to know that!
I've been "Googling" this afternoon and came across some electrolyte capsules- sodium, potassium, magnesium, calcium, etc. Have you tried these or similar?