3 hour cure for stomach flu:

Take 1-2 tablesoons Kaopectate.
Sip slowly, a cup or two of Coca-Cola (not Pepsi). SIP do not gulp quickly.

The phosphoric acid in the Coke will kill the bug in the tummy, the Kaopectate will lock up the diarhea, and you will be just about dandy in 2-3 hours.

If this does not work it isn't a stomach flu because this never fails for stomach flu, been using it for years with myself and the kids.