I'm told that i can't take plain water during confinement otherwise the swelling of my tummy will not subside; we are only allowed to take red dates and longan drink. Is this true?

I take lots of vegetables cos of the heaty food that we eat. It is a belief that we can't take plain water but sips of it is fine with me. I take lots of soup as a replacement of water as well. Not only that, taking longan red date tea is important for hydration and also it promotes breast milk. It is a must for very confinement.