You might want a bit of hose you can attach to your tap so you can flush water through the tank easily for washing. Not essential but usefull...

Depending on the water in your area you might want to add a drop of wetting agent (basically washing up liquid) to the final rinse to avoid water marks, but you don't need it - it's probably best to not worry about it for the first few goes, and see if it turns out to be a problem.

Ian