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

I drank red date tea daily for a month, shower wise herbal bath alternate days and will use warm water to shower whenever i did not shower herbal bath. But i follow the rules by not showering hair for a month, i use confinement dry shampoo recommended by my confinement nanny.. You follow the rules strictly then you won't have any back aches or any other things happening to your body. I followed the rules strictly so now my body not aching plus do not touch cold water