That's a lot of working having to cup them at feeding time. My girls are big pigs. Two out of my eight will jump out of the water to eat there food. I have to be careful or they will end up on the floor. I usually feed frozen and use a turkey baster. I just put the end of it in the water full of there food and they all come and snatch out there share, of course I only have one male guppy in there at the moment so they don't have much computation. I think yours will get the idea of eating quick over time.
Sorry you couldn't find the bulbs, there should be a close equivalent to them at your Lowe's if not the same ones. Even Wal-Marts around here have a version of them, you might check there.