The Kargi dolmus will take you to within around 1/2 km of the museum. You get off when you see the Kargi sign with red lines through it & take the road to the RHS, which is opposite a small workshop. It's a fairly narrow windy road, but reasonably flat & interesting to look at the flora & fauna as you go. Quite a way along, the road forks & take the LH road, there is a small sign to the museum here, & that brings you to the entrance to the museum.
I'm not sure of the frequency of the dolmus, but from the number that pass along the Gunlukbasi road, I'd guess around 10 - 15 minutes.
During the winter, they were just doing a village soup at lunchtimes, there was a cauldron full made for us, served with huge quantities of bread. The only alcohol they had at that time was efes, for which there was an extra charge, whereas, water, chi & turkish coffee were all included in the price of the soup, which I think was 5tl.