Im going to replace my sink, and toilet, and bath?
You should have a mains isolation tap inside your house to use for such an occasion. Having just installed a new bathroom suite myself, I suggest that you put isolation valves on all the pipes and use flexi-hoses to connect to your taps and toilet supply. This way you can soon have the water supply turned on again and also it will help in the future if you can isolate each tap individually rather than having to turn off the whole house. This may be part of the building regs now anyway.