GAZA CITY, Gaza Strip — Caught in the fighting between Israel and Hamas, Gaza’s civilians are increasingly struggling to get by. There is no electricity 21 hours a day because power lines have been hit. Water taps have run dry because there’s no power to their fuel pumps and tens of thousands of displaced sleep on the floors of schools and hospitals. The hardship is felt more keenly as Muslims on Monday started observing the Eid el-Fitr holiday, which is meant to be a joyous time of festive meals, shared traditional sweets and family visits.