In present era, clean water is need of human society for better medical growth. in big cities various water cleaning devices are available but in rural area,s where electricity is not much high, need to develop a device which works on natural heat source like solar thermal energy. Solar still is one the device which work on solar thermal energy. This device has very low performative graph, so from previous decades, various researchers try to develop improved solar still which has better thermal performance. In present study, researcher try to develop a solar still which has improved performance than simple single basin solar still. To develop improved solar still, external source and separate condenser is used. The experimental setup is installed at mechanical engineering lab of college building and all experiments are performed for 1st June to 10th June 2017 for all three setups of simple solar still, external water source and separate condenser. The final conclusion of present study is that both external source and separate condenser source performed better then simple solar still for present experimental study.