As a follow up, here is a list of organizations working specifically to support water justice in Palestine: https://www.waterjusticeinpalestine.org/sister-groups

Apparently, the Middle East Children's Alliance works with local community organizations in Gaza to implement water filtration and desalination units in local schools. Knowing the degree of water insecurity in the region, implementing these tools at the community-level seems like a promising approach in terms of sustaining a larger reach.