My toilet drips into the bowl after each flush. It sounds like running water into water. Is there something that can be adjusted to fix this?

Easy fix. Change the flapper inside the toilet to a new one. This should fix that annoying drip drip drip. The old flapper apparently got eaten up due to the minerals in your water. I have to change mine every year or so.

Twinkie is probably correct but your description is pretty thin. Where do you see the drip or do you just hear a drip?