Can you cure UTI's without going to the doctor?

Nope. Once you have one, only antibiotics will make it go away.

As a side note frequent UTI suffers are often counseled by their family doctors to incorporate Cranberry juice into their diets as it aides in the prevention of bacteria sticking to the inside of the bladder walls. It is considered a "treatment" for UTI by many alternative medicines sources but is not recognized as such by the A.M.A.