Is this a special breeding project or rare, valuable guppies? If not I wouldn't go overboard. In a healthy, aged tank, they'll do well with very little food added to the tank. If you're going to feed multiple times per day, you'll need to do multiple water changes per week.
Nothing against the guppies, but the little buggers are like parasites! Once you've got them, you'll have more than you want. I started with 5 and have probably given away 100s from those original 5 and I do no special feeding for guppy fry other than my standard 5 feedings per week.