Electric shut off valve for RO/DI??

[Cazoom]

you can give your local coffee service a call and ask for a water shut off solenoid....its 120 volt... hookup in your water line(its 1/4 inch stainless fittings...wire to a light switch and you have control over the water line via this switch...should only cost $12 or so....
i use them for airline and water...all comercial coffee machine use em...
(like all water solenoids you should rebuild yearly to avoid leaks...) its a .25 rubber seal ask for a few when you buy the solenoid...