The zero water filter will work fine. It's basically just a small deionizing filter. Unfortunately they are expensive. You only get around 25 gallons per filter and I've been told that replacement filters are pricey. I've also heard several complaints about a fish smell after the filter has been used for a while. The grocery store self serve machines are reverse osmosis filters and they average from abou $.25 per gallon to about $.39 per gallon. Much cheaper but you can also get r/o units on e-bay for around $100. This is your best bet in the long run.
