Just look for window insulation kit. It's just plastic sheeting that you put on your window frame, stuck in place with double sided tape. You then get a hair dryer to tighten the plastic, so it holds tout. This process gives you an air gap between the window and your rooms warm air, so often cuts out condensation.

I use it every year, it makes a huge difference for me in wiping down windows alone in the morning and it's deffo warmer sitting next to the window too.