The gift of water saves lives, which is a hugely rewardable action. Allah says in the Qur’an, ‘And whoever saves one [a life] – it is as if he had saved all of mankind’. (Qur’an, 5:32)
Imagine this – every single time the clean water you donated saves someone’s life, it is as if you have saved all of mankind!
It is ‘the best charity’
‘The Messenger of Allah (saw) was asked, “Which charity is best?” He replied, “[Providing] water”’. [Abu Dawud]