nice house-cottage. Where is it located?
Norway (Noruega) - 60,5°N, 900 metres altitude... a dry bath. It is economical, easy to do and also you get your own compost for vegetation...
Thanks for this. Yes, it is a good idea and the method is similar to the traditional way of building toilets. The problem is that the compost process is slow at high altitude, especially in the winter months = risk of smell. For me, a separate house is difficult to use (imagine a snow-storm) and almost impossible to build. ..hot water solar heater can help you in summer but seeing those snowfall I do not think it is very hot there...
Warm in summer, cold in winter. Actually, a solar thermal collector (colector solar) should work well with cold/snow because of the high altitude and reflection from the snow. The collector would be mounted almost horizontally on the South wall to catch the low winter sun and avoid being covered by snow. Tests indicate an indoor temperature rise of 10°C or more with dry air. Additional heating will be necessary in winter, but it seems even a small solar collector could make a big difference. A water based system would not be a good idea in cold temperatures, though. Also, the air based systems are simple, easy to install, light weight and inexpensive. One manufacturer's pictures* seem to illustrate the point 
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