I put the battery backward on my honda prelude while it was running and now it wont start can u tell me what wrong

who put alternator maybe something wrong.

I had exactly same thing on my boat recently...which has a car motor in it. And I also charged the battery and I also had a reading that said I had charge. HOwever, I tried another battery from a car and it suddenly worked. Don't know why, but it really was the battery. When I put the old one back in, it still wouldn't start. With a new battery it's fine. Ya just never know why sometimes!! Good luck!

THE WATER PUMP DOESNT HAVE NOTHING TO DO WITH THE CAR STARTING , CHECK BATTERY CONNECTIONS , POSIBLE BAD BATERRY , ALTERNATOR NOT CHARGING ECT ECT.

does it even crank? put the old ones back and if it starts then you have the wrong spark plugs or they were not gapped correctly.

Well, you seem to have replaced parts that I would have changed in the course of trying to solve a starting/charging problem.
And a tune up problem.

I would recheck the connections at the battery and clean with a wire brush if necessary.

However, the alternator, if working correctly, should keep the car running after you start it with the jumper cables. There's something wrong there, I think.

If it has been sitting for 3 years it could be a number of things. First thing to try is a good tune up (plugs, wires, oil change, air filter, and fuel filter). If the plugs have fouled out they are not getting enough spark to burn the fuel. Also if the fuel itself has turned, you should try to drain the tank, this is not feasible at times and can be substituted by adding as much fresh gas as possible and a can of Octane boost/ Gas drier. SeaFoam is what I would recommend (found at your local autoparts store. If you have over half a tank of gas that has been sitting that long, you will need to find a way to drain what is in it. There are a few tricks to doing this without dropping the gas tank or sucking it out with a garden hose. Try the tune up first though.

GET A TUNEUP DONE, COULD BE YOUR SPARKPLUGS OR COILS.

sounds like you have a dead battery and possible a bad altenator have the battery checked out and replace if bad. If not recharge and if the car starts have the charging system checked out you may have a bad altenator or voltage regulator probably built in the altenator. Possibly the starter but not likely since it stalled while running.

put gas in the car, take the key put in the car , turn it on without starting the car , turning the key on turn it off 2 times should start

Sounds like you accidently pulled the thin wire from you starter motor. Look at the connections at the end of the solenoid, mounted on starter motor.The thick red wire is Battery + next to that connection is a smaller male push- on terminal, locate loose wire (thin) in the same area and reconnect to male push-on terminal on solenoid or check if earth cable between body/battery to engine wasnt removed in the process.Also some vehicles you have to engage the clutch before starting, check for a switch located on clutch pedal where master cylinder connects to clutch pedal (Is clutch switch mounted and wiring connected?)