I recently got three rectangular plastic tanks (40 gal or more 2 sizes) . I believe they are for RV/bus use. I thought about using my dehumidifier water to fill them.Then I read that it would make you sick. Although I would boil it if was for drinking or cooking or Use it the way it is to flush toilets. Or I could fill them with city water now. What problems arise in storing water as far as bacteria, algae? Also i was going to use a 12v bilge pump I can connect to a small solar panel/batery thing I got going. That way I could pump out older water as I add new. Thanks for any advice