some kid comes and helps you collect all your escaped chickens--give them an empty bottle
some kid saves your sister's life by bringing her a healing potion you made--let them keep the bottle the potion was in, that's an adequate reward
some kid helps you get back the fragments of your soul that you sold to a bunch of ghosts in exchange for immense riches? a bottle is a good reward for that, it's not like you're literally made of money or anything oh wait you are
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@noiob You do buy one in alttp, wind waker, albw, and i think minish cap you buy two?
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@Felthry tbh I haven't played much of the 2D Zeldas
@Felthry Ocarina has four but you don't buy any of them