Sounds like you have a dangerous situation here. One way for a battery to squirt out acid is if the vehicles alternator is overcharging. Should be charging below 14.5 volts. You can use a multi meter to check this yourself. Just start the engine and connect the meter to the two terminals on the battery. There are some local garages that may offer to do this check for you as a courtesy. The other way for this to happen is, if there is a crack in the battery. Look around the battery to see if it is installed properly with restraints and nothing jabbing into it. You may see crack around the positive and negative posts caused sometimes by over tightening of the clamp bolts.
I am sure you are capable enough to do this but It is always best to let a professional do dangerous things like this to insure the proper precautions are taken.