Bottled water 1 Clean waters 1 Copper oxides 1 Cost benefit analysis 1 Desalination 1 Distillation 1 Economic analysis 1 Economic aspects 1 Melting and solidification Nanoparticles 1 Paraffin 1 Paraffins 1 Phase change material 1 Phase change materials 1 Productivity 1 Solar heating 1 Solar still productivity 1 Storage temperatures 1 Techno- economic analysis 1 Techno-economic analysis 1 Thermal conductivity 1 Titanium dioxide 1 Water temperatures 1