You have to make a stew. Use the black flower by the waterfall plus the orange flower 2x
at the bottom of the screen. Have a villager eat the stew. They won't need to breate
anymore. Drop them in the pond and they will be able to get it.

To retrieve the piece deep in the pond, you will need to make a stew. The stew must
contain the following three herbs: one sprig of the blackish/dark purple strand of flowers
behind the diving rock and two sprigs of the orange/red lily located at the southeast
corner of the village. You must make sure you have them follow the steps to make the stew,
and they must eat it. Once they have eaten it, they will not feel the need to breathe
(thus allowing them to go in deep water).

do you need to have three food under tech!?

To retrieve the piece deep in the pond, you will need to make a stew. The stew must
contain the following three herbs: one sprig of the blackish/dark purple strand of flowers
behind the diving rock and two sprigs of the orange/red lily located at the southeast
corner of the village. You must make sure you have them follow the steps to make the stew,
and they must eat it. Once they have eaten it, they will not feel the need to breathe
(thus allowing them to go in deep water).