Vegegreens supplement rocks for this. Just have lots of vegies in your diet. Fruit is less acidic than grains, so it's always better to eat an apple than a slice of bread.
Don't be afraid to have a couple tums after each meal (calcium carbonate) The calcium is good for your bones and your CNS, and carbonate is your bodies prime choice for an alkaline buffer. Plus if you are someone who drinks coffee, the tums will be welcomed in your stomach, as caffeine causes an increase in HCL production in your stomach.
I can't comment much on the acidity issue, but I've heard from many sources it's nothing but bad. Increased risk of cancer, autoimmune disease, and poorer overall bodily function. The western diet of grains, sugars, and grain fed beef causes most people to live in a state of chronic acidity.