Hi Nicola
I had to go through the same ordeal about a year ago. We had our bath removed and a special disabled shower (for my mum) installed. We were without a bath or shower for a week because the builder had to rearrange the whole bathroom and lay new pipes underground. I found it stressful but it wasn't as bad as I had expected. I used lots of baby wipes to wash myself in the mornings, but I think a flannel & soap at a washbasin would have been more effective because baby wipes leave your skin feeling slightly sticky.
It helped me to remind myself that even a shower or bath does not make you 100% clean. Tap water contains bacteria and impurities, bath towels are not sterile, and everything you touch when you step out of a bath is at least slightly grubby. So the difference between a proper bath/shower and 'roughing' it with a spartan paddling pool is not as big as you might imagine. It may help if you can acclimatise yourself beforehand to the fact that you are still slightly 'dirty' even after a proper bath/shower, however clean you might feel.
Best wishes,
Parvez