You can prepay your account before you leave based on your average monthly bill. However, if this does not cover the actual charges before you return, you could be subject to penalties due to late payments and disconnect. Just send your payment to: Prescott Valley Water System, P.O. Box 5165, Harlan IA 51593-0665.
The account will bill against the credit. You can also sign up for automatic payment deduction of your bill through your bank account.