Clavamox (clavamic acid w/ammoxicillian) is the most common treatment and comes
in both pill or liquid. Also, if there are other cats
in the home, they would need treatment too. Even if they don't have symptoms yet...as they may have it but not bad enough for symptoms so you just want to make sure incase they would get sick later and reinfect the home again.
If your kitty is not eating much or at all and not drinking much or at all please get to the vet soon.