Topaz of the Well
Pebble of Water. You can use an action to fill a container with fresh water using this gem. The gem can create up to 5 liters (1 gallon) of fresh water every 24 hours. You can do so by speaking a command word while touching the gem to a container that is not being worn or carried, such as a mug, glass, bucket or barrel. The container is filled with potable water untill filled completely or with as much water as the gem can still create. Waterbreather. While holding this gem in your hand, you can use a bonus action to gain the ability to breathe water. This effect lasts indefinitely, but you can only breathe water whilst holding the gem in your hand.