Injectors or using - ha - built in injectors like your teeth can still be time-consuming if you're trying to save everyone. Getting it into the water sounds much more efficient, but I'm no scientist.

[ Smiles, tilts his head; ] Well, you certainly don't need to be afraid of what Senku-chan might think of you. He has an incredibly open mind - I think you'd only offend him if you believed in pseudo-science.

Of course, if you wanted to cause a rant, ask him about astrology. [ Winks. ]