Terry writes:

My bill was 11$. It said my usage was 2 units. I know that is not
gallons.

Have a look at your meter. The units will be listed there on the dial
plate. Cubic ft, I believe is what you may find if you're in the US.

Your usage, barring the subject period being only a few days, was
likely very low because prior bills were estimated and not based on
actual meter readings, and the water usage over the prior months was
lower than the estimate.

--
Todd H.
http://toddh.net/