Stand alone CD player on seperate Battery

Ok i want to hook up a extra CD player and speakers i have laying around to a battery and have it completely independent from the car. I am acutally going to use this on a river. My question is as far as powering this. Do i need a 12v car battery or what? how many amps? how long will it last before i need to recharge the battery...    thanks guys

No a river. In arizona we have a 4hr lazy river on the salt river. People will create rafts and stereo systems for the ride. I have all the gear laying around so why not. Just need to figure out how to power it for a few hours. And be able to recharge it for next time.

will i need to put something inline to drop the amps? an inline fuse or something... i dont want to fry my cd player.   Any idea how long this should last?

No a battery does not put out a certain amount of amperage the CD player will just draw the amperage it needs. Think of the battery as a "pool" of amperage that you can use. as for the other question how long it will last depends on a few things like power output of the CD player volume levels etc. a good deep cycle battery should last for the 3-4 hours that you need it I would think.

im going to put an inline 10amp fuse plus there is a 10amp fuse in the back of the cd player... am i missing anything here?

OK I finished it works great now just need to put the finishing touches on the box and make it float...thanks for all your help guys

The inline fuse is to protect the wire...NOT THE CD PLAYER!!