only tool need was razor knife sissors
butter container (large)
piece of foam from something i unpackaged
so on the lid i cut a square hole , the i cut a square of foam larger then the lid hole
on the foam i sliced into the side to give a space for overlap of lid to slide in ,, foam can come in and out of lid
there is 4 slices in the foam as was first time making
so ive had cuts in for 3 days and they are still happy
just in tap water , ph 7