Your water level is displayed right on the screen
Water should be drinking from glass bottles with water and potions. water bottles replenish to 5 units of water, a slice of watermelon replenishes 3, apple - 1. Eating meat reduces the supply of water. Each pumpkin pie eating reduces the supply of water to 1.
Also, water is reduced by 1 every 5 minutes! As well as the destruction of certain units (e.g. after breaking stone block 256).
When walking, running and jumping water supply is also reduced!
After the respawn of your water level - 16 of 20
===============================================================================
I recommend to enter the command /gamerule commandBlockOutput false
CREATIONS
MINECRAFT-SCHEMATICS.COM