So. I switched to formula when she was 5 weeks due to my supply stopping. I somehow missed the memo about what kind of water to use. I didn't even have a second thought about giving her luke warm tap water. Now I've read that you're supposed to boil cold tap water, but only for exactly one minute and then mix the formula right away. I'm sorry, but who the heck has time to do this? Is this really what everyone does? I modified the Luke warm tap water to a brita water filter to make her bottles now. What do my fellow formula feeding mommies do?