I saw this request for a dye-able water plugin -> https://bukkit.org/threads/dye-able-water.481666/
The thread is now locked, but the response wasn't very positive imo...
There's nothing like a good challenge... and although there are some aspects that cannot be reproduced with a plugin e.g. coloured flowing water, other features can be easily implemented in conjunction with a custom resource pack e.g. cauldrons & dying leather armour, water bottles and water buckets.



New in version 1.0.2+:

• Create lava cauldrons
• Brew potions in cauldrons
• Resource pack updated

Resource pack:
For 1.16.x - https://dl.dropboxusercontent.com/s/whfly7selv69gou/DyeableWater_1.16.zip?dl=1
For 1.15.x - https://dl.dropboxusercontent.com/s/4ock8bc2gzjc7w5/DyeableWater.zip?dl=1
For 1.14.x - https://dl.dropboxusercontent.com/s/ghdqouk73d0vixl/DyeableWater_1.14.zip?dl=1

• To make a cauldron for brewing, place a campfire underneath it, then just throw items into the water.
• Three permissions - dyeablewater.use (allow players to dye water in cauldrons), dyeablewater.lava (allow lava to be placed in a cauldron and destroy items thrown in it), dyeablewater.brew (allow a player to brew potions in a cauldron)
• No config.
• 1.14,1.15, 1.16, 1.17 & 1.18 compatible.