I am planning to start a business of water plant i.e. purifying and supplying of water is halal or haram in Islam or it is permissible in Islam.
بسم الله الرحمن الرحيم
It is halal. You should maintain balance in the price, it is better. It is not better to take more price than usual.
Allah knows Best!
Darul Uloom Deoband