You have to be specific to answer properly. Where do you live (how is your water) and what treatment/filtration are you considering.
Lots of folks on well water have hard water, bad tasting, etc... Other may have lead, or other pollutants.
The truth of the matter is you should get your water tested at an independant lab. Based on the results, you can tailor a system to your needs, if any.
Love it. I do a very similar dish, but I'll add a teaspoon of tomato paste in the rice water and I crush the cardamon pods and blow the papery shell away so the cardamon stays in. I get more flavour that way.
My dog (lab) knows the difference between me opening the fridge and me opening the deli-drawer. Canadian fridges have one fridge drawer for fruits, one for vegetables and one for deli. (Meats and cheeses.) The differences are basically humidity/ventillation.
But that is an individual, not you.