part A is absorbed by the film at the rate of a bout an oz for every 120 roll of film -- I would have no problem with the way you are describing your setup --- water for stop would be fine also -- you may want to plan for 5 baths. A, B, a water stop/rinse, fixer, and then another water with flowing water for a final rinse. after that, a quick run through photo-flow and hang to dry.