An installation kit for an alkaline water ionizer unit or reverse osmosis unit may comprise a valve having two separate flow paths. The first flow path provides tap water to the alkaline water ionizer unit or the reverse osmosis unit. The second flow path connects to a “by-product” water outlet of the alkaline water ionizer unit or the reverse osmosis unit. The “by-product” water may be drained to the kitchen sink or stored in a storage tank for later use.