How to plan for an overnight Kayak/Camping Trip?

My two friends and I are starting to plan for a 2 day one night kayaking/camping trip. As far as kayaks go we are looking at buying some entry level Pelican Potomac 100 Kayaks. Will these be big enough to hold the supplies needed (food, small backpacking tent, water, small sleeping bag)? We haven't bought anything yet but are prepared to shell out quite a bit for this. Are their any suggestions as far as specific supplies go or any general advice?