Chris, pleas read John's post. It's right on the mark.
You can get your self some PH paper designed for testing saliva and urine so that you can (over time) begin to zone in on the correct PH. Like John says, 7.4 is a good target. Alkalanizing foods are mostly veggies and especially the green ones. Some also use juicing of fresh veggies to alkalinize the body. Meats, and most grains are acidifying in nature. Lemons are suprisingly alkalinizing to the body. There are some great books on this. I believe this is why macrobiotic and whole food diets are so healthy. Lots of nutrients, enzymes and alkalanizing in nature.