If you live in a place like Dallas, just add a T with two ball valves to the condensate drain from your central air unit. Run one side of the T into your normal draining spot (usually the sewer after passing through a P trap and some people here let it run out on their lawn a distance away from their foundation) and the other side into a 5 gallon bucket. Turn off the normal drain side and divert the other side into the bucket. You'll be surprised how fast you have a bunch of distilled water. And yes...it will boil. And while this type of "distilled" water is useful for all sorts of things, drinking it is a really bad idea.
