there is NO reason for Israel having to provide ANYTHING to Gaza. Gaza is a separate, hostile entity. Israel is not and should not be obligated to have to support them with waterm electricity, currency, or anything else for that matter, Gazans are Egyptian citizens and gaza is a part of egypt, let Cairo take care of them...
Egypt to hold parliamentary election in 2 phases starting Oct 18-19 (Reuters)
from the article: Disengage from Gaza once and for all