You can choose to do several things:
A) Stick with just Online Only. It's much cheaper than the monthly pass, and you'll have no problems looking up foods/staying up to date on how many points you need.
B) You might want to look into the PointsPlus Calculator with Daily & Weekly PointsPlus Tracker. It not only calculates Points for foods, but also keeps track of your Daily & Weekly Points. Just update the information as your weight changes and it'll give out the new Daily number.