Message in Bottle what it do?

[Nephew Jarek]

cuz i have no idea

[Clawyer]

Did you open your inventory and take a look at the symbol? The mermaids at the end of each level require you to bring them an item of that certain type.

[Stiltskins]

If it asks for a "generator" it actually wants ammo, not sure if that's a mistake but it didn't make sense to me.