Toilet No. 1:
Two inverted quartz stairs, the top at the back is made of quartz and the toilet seat is a pressure plate
Toilet No. 2:
Cauldron-style water pumping, wooden toilet seat, flip-up lid
Toilet No. 3:
This toilet is similar to toilet No. 2, with the flushing system replaced by a funnel type.
The above is all about how to make a toilet in Minecraft. I hope it can be helpful to everyone.