This guide will explain a few ways to build bridge in the Necesse game.
Guide to Build Bridge
Grab a bucket and use it over the water tiles you wish to be your bridge. It’ll remove the water, then you just put down a wood or stone path. That’s about the best we got I think.
Theres an item called land fill. Cost like 2 stone to craft, it lets you place a piece of land on water tiles.