A pharmacist, gave me this recipe for "tourista". He said he got it from a doctor.

Mix:

1	tea bag in one quart of water
4	tablespoons of dark Karo syrup, or light Karo or molasses
1/4	teaspoon of salt
1/2	cup of orange juice

Drink this for 24 hours with nothing to eat. The theory is that it starves the bad bacteria.