Just get the spray, not the shampoo. The spray is 180mL. If you use 1mL twice a day like directed, it will last 3 months. I think it is better to get anti-oxidant effects from cheaper stuff like green tea extract, and use the Tricomin 1mL every other day. The skin remodeling should be cumulative. Also, with CP's, lower doses do less per day, but too much actually burns your skin. I say just do it EOD and make it last a year.
Now if you just want a clean easy regimen, and it is all you are willing to do, use the twoce a day with foam, nizoral, and finasteride will be very easy. Tricomin dries in minutes I heard. No mess. Also rotate the Nizoral with T-Gel Greasy if you want.