"Polynesian Resort -- 9 p.m.
Grand Floridian -- 9:15 p.m.
Wilderness Lodge -- 9:35 p.m.
Fort Wilderness -- 9:45 p.m.
Contemporary Resort -- 10:05 p.m.
Magic Kingdom -- 10:20 p.m. (only during extended MK park
Note that when the Magic Kingdom Fireworks are scheduled for 9 p.m., the Electrical Water Pageant runs about 7-20 minutes later."
You could maybe book a meal at one of the resorts or just grab a quick service or snack and drink to have while you watch the pageant