Use the T-Max 100 Direct Positive Film Developing Outfit with T-Max 100 film. The kit costs about $30 and processes 12 rolls of film. T-Max 100 film is exposed at around ASA/ISO 50 for normal contrast in the resulting slides. Follow the instructions in the kit for use.
Be forewarned that it takes many 1 liter bottles to hold all the different solutions in the kit.