distilled water - only?

I've been slowly preparing my body (and soul) for a 3 day water fast, starting a few weeks ago by dropping gluten, then animal products, and this week all raw excpet for a vegetable and lentil soup for dinner. Had a fruitarian day yesterday, and today I've had an orange and a mango and a canteloupe so far. But i suddenly feel like now's the time for the pure Water Fast to begin.
The problem is i'm way too lazy to go out and buy distilled water. Plus i thought i heard that distilled water can leach minerals from your bones. Do you supppose i can get away with boiled tap water? My main purpose for this fast is spiritual, the detox benefits are great but not the main draw.