RUBS system implementation for newbie

[Ally Kumar]

We recently acquired a triplex that has one water meter as previous owner was paying that bill. Water bill runs from middle of the month to middle of next month. In billing back tenants based on number of occupants, how should we handle this since they pay rent in beginning of the month and is on different cycle than water bill. Should be take half months bill say from Aug 15- Aug end and bill them for half of month and then bill again in mid Sept for half of Sept from Sept 1-15? Average out the bill and then bill monthly at the end of the month? Adding 2 additional water meters by city will cost $1200 and then plumbing charges to run separate lines from those meters. There are no common areas to maintain to deduct for that owner's expense. Thanks for helping out.