Doctor's Orders

A woman had some problems, so she went to her doctor of twenty years. They had the following conversation:

Doctor: Take the red pill after breakfast with one glass of water.
Woman: Ok.

Doctor: Take the blue pill after lunch with two glasses of water.
Woman: Ok.

Doctor: Take the yellow pill after dinner with three glasses of water.

After giving these instructions to the woman, she asks, "Can you tell me
what's wrong with me Doctor?

Doctor: Yes. You do not drink enough water.