A lot of times there isn't a lot of water in the bags (If any at all and just a wet papertowel) so drip acclimating doesn't take long generally considering there is little water to double. I have done all of the above though- float and dump them, little bit of water added every few minutes, and also dripping. I don't know that I have had better luck with one over the other. A few suggest dipping them in one or two cups of tank water in separate containers to ensure no lingering bag water remains on them before putting them in the display tank...