After giving birth, is it truth u cannot drink plain water and bath for the 1st 14 days? Why?

Old wives tales. No your uterus will not get swollen or whatever the reason is. Pls do drink alot of water to hydrate yourself as you will feel thirsty & hungry after breastfeeding baby. And also because of our humid weather. I've given birth 4 times and I shower after birth. Back home, I shower twice a day, everyday for hygiene reason but with warm water only until my confinement ends. Also to clean my wound down there. Don't like the sticky feeling on my body and it is really disgusting not to have any shower.