The largest environmental challenge that Nepal faces today is mismanagement of water. Impure water has led to heightening waterborne diseases and in spite of being able to suffice water needs in seasons of drought, rainwater harvesting hasn’t received much attention in Nepal. Especially when water is sufficient, we care less of consuming rain water. Yes, it’s a matter of question if rainwater is safe to drink. So in this doubt, lab test has proven that harvested rainwater is 100% safe to drink after rainwater harvesting. Another substitute is bio-sand filtration. Even the jar water, that we are so confident and claim to be pure has been found of having contamination when tested so it’s a high time to switch our attention to affordable sustainable water purifying systems i.e. rainwater harvesting and bio-sand filtration. Best Paani installs cost effective rainwater harvesting and bio-sand filtration systems, and recharges the groundwater aquifer with the spillover.