Hi, it appears the legacy WaterPouch_ColorBase item(s) were renamed to WaterSkin_ColorBase in 1.30 alongside the new waterskin.p3d model, however, in the PurifyWater recipe, the old WaterPouch_ColorBase is used in the ingredient list rather than the newer name.

The result is that you cannot purify the waterskin despite every other bottle in the game being purifyable with chlorine tablets.

1. Spawn or create a water skin

2. Fill it with dirty water

3. Try to use chlorine tablets to purify it

Should be able to purify leather water skins with purification tablets