well perhaps they should've thought about that before digging up the water pipes provided by international humanitarian aid organizations to make into rockets. If Palestinians want to blame anyone for lack of water, they should start with hamas
btw, hamas made a video bragging about this
edit: according to their own propaganda, these were pipes left behind by Israel "to steal gaza water", not pipes delivered as aid: https://www.memri.org/tv/jazeera-documentary-hamas-missile-industry-iran-sends-kornet-fajr-missiles-to-gaza-reclaims-munitions
well they don't make everything in gaza, true: https://www.memri.org/tv/jazeera-documentary-hamas-missile-industry-iran-sends-kornet-fajr-missiles-to-gaza-reclaims-munitions