I think the box explained what is the problem of the water.
Thank you for uploading and translating this, mister Yuno.
The art is nice but for me, the story is not as good as other stories of yuppai, but yeah, good for anyone who want to enjoy yukkuri's demise and painful expressions, and how shitty the parents are.
After drinking too much water their internal beanpaste has become watery. Little ones, be easy!
If your tum-tums hurt, why don't you go to the toilet?Huuuurjzh
Huuuurchsh...Reimyu ish going too...Little ones what is it noze?Yuguuuuu...
Maricha ish going to toilech noje...