You might want to end up buying a 30 or 40 gallon rubbermaid from any ol' store for around $5 That way you can fill it 3/4 (room for sloshing), a lid to help keep the water in, ability to drill holes in the lid for air tubes, not worry about it breaking. Also, the darkness might help to keep your little guy calmer...
Also, instead of tank water, use fresh water of the same ph/quality/temp, get some ammo-lock and dose the water...need to keep those ammonia levels down for the trip. Bring a few extra jugs of water for some PWC along the way, and be ready to set up the tank ASAP. Keep the gravel and biowheel or where-ever your main load of bacteria are moist/wet so you don't go through a large cycle.
About 2-3 days before you begin the trip, don't feed your fish at all...also will help keep the waste levels down for the trip. Good luck and God speed.