Loseing water with no leak.

What is your question?

I am Loseing water in my 1994 toyota camry but I can't see any large leaks (no pooling of water ever) periodically, say every 200-300 miles it will overheat and I have to add about a gallon of water? What is going on with my car? Greg, phoenix,AZ

What makes this problem better or worse?

Adding water

How long has your 1994 Toyota Camry had this problem?

4-6 weeks