Park paid water at closing, buyer wants to quickly move to tenant paid water, 12 month leases

Hi Folks,  How fast can a new buyer move to tenant paid water via RUBS or some way to apportion city water bill out to the POH tenants?   All 12 month leases.At worst is this wait till each lease expires then add water to the lease details?This is GA, GA tenant law as in most states I bet, buyer has to honor the existing leases.tnx curt

In TX we had to honor a 10 yr lease and couldn’t bill the tenant for any new utilities.