I try to only by half of what I can afford, as the other half will go for jewelry or clothes! It also definitely helps to get her involved. I'll call Genie in the morning from work and say, "Hi, Honey, how are you doing? How's your day going? Would you mind checking to see if that Ricordia has opened up this mornng yet?"
Go slow and careful about it and eventually she'll call you one day and say "There's a funny noise coming from your top-off container, what's up" "Oops, forgot to fill it this morning, can you do it?" Of course it helps if all she has to do is grab the hose from the RO/DI storage tank and open a valve to fill it up!
Eventually you'll know she's on your side when she calls and says,"Oh my God, when I put some blender mush in this morning the Favia expanded his tentacles like crazy!"
Of course, the "Piece de Resistance" is when she gives you a Gift Certificate from your favorite LFS for Valentines Day! (Understand you wouldn't want to do that to her. Flowers, chocolates, jewelry, clothes and Dinner are still her choices!)