Don't you just love orchids? I try to have several in bloom around the house at all times. Here's my advice:
instead of "watering" your orchid, put an ice cube in the pot everyday or every other day (2 if it's a big pot). this creates sort of a slow drip watering for the orchid.
keep it out of direct light ... filtered light is better.
after it has lost all of its blooms, fertilize it by purchasing a water soluable fertilizer for orchids, filling a deep bowl with the liquid, and submerging the entire pot into the liquid. dip a cup into the liquid and pour some of the liquid over the leaves. leave it submerged in the liquid until it is completely saturated (1/2 hour or so), and then let it drain well.
I like to fertilize once every six weeks until I see a stem emerging -- then stop fertilizing. Most of my orchids bloom twice a year (and can be in bloom for up to 3 months).
If the leaves start to turn yellow and fall off, you have over watered it.
Sometimes you'll get a "dud" or tempermental orchid, and it just won't rebloom for you. Give it a year then toss it is my advice.
Hope that helps.