[MargaretR]

Commiserations - your hospital experience sounds alarming.

Ever since I had C-Diff 30 years ago, and was on a rehydration drip for 2 weeks, I begin self administered oral rehydration whenever I have diarrheoa.
It is not enough to 'drink plenty of fluids', you need a rehydration solution

A basic (home made) oral rehydration therapy solution is composed of -

30 ml (6 level tsp) of sugar
2.5 ml (1/2 level tsp) of salt, dissolved into
1 litre (4.25 Cups) of clean water