Electrical problem, please help

[Walaboom]

Hello everyone, our car is having this electrical problem, we took it to the shops and shops are having trouble figure out what is wrong, please help if you have seen this problem before.

1999 SentraWe had bad alternator 2 months ago and replaced it with a new alternator, two months later, one day, suddently the car won't start. We jump start the car, drove around for awhile, shut the engine off and car would start again, looks like alternator is charging and battery is taking the power, but next day, battery dies again.

We replaced battery, same thing happens, feels like something is draining the battery overnight, batter would charge, but if you leave the car off for a day or so, battery goes out of power.

Also when we drive for awhile and check under the hood, there is battery water all over the battery, looks like we overcharge the battery after driving around for awhile. Handbrake and Battery light would also come on after we drive for awhile.

First shop told us is electrical problem and recommended us to go to dealer. We went to the dealer, dealer told us we have bad wiring for our CD Player. He rewire the CD-Player, we drove the car home, battery water all over the battery again, and next day, car won't start.

Please please help i would really be appreciated. Thanks in advance.