[lungfish]

Salts are actually minerals. The most important aspect of being "hydrated" is having adequate minerals, particularly salts. Electrolytes are more or less salts. The best electrolyte solutions have a high percentage of Potassium (rather than Sodium like table salt).
I use a sports drink made by Twin Labs called Cytomax (google search) which is an excellent electrolyte source and has some other useful chemistry as well. It really does inhance your diving performance....
Lungfish