As it is temporary then there is no problem and good on the employees staying, I think you are providing all you can. Depending on how long it lasts as temporary is what you need to consider and what opitions are then open to you.

Forget the anti-bacterial hand wash gels. The evidence is simply that in practice they provide little or no benefit and may actually increase the possibility of the skin becoming colonised by transient micro-organisms. If water is an issue, then unless the skin is visibly soiled a properly formulated alcohol sanisiting rub is actually more effective and less damaging to the skin. If the skin is visibly soiled then a mild, unmedicated, skin cleanser should be used.

If you need more detailed information on this PM me with your e-mail address and I will send you a more detailed explanation.

Chris

If it goes on for several days, you could provide a self-contained welfare unit, which can have its own water supplied by a tank for hand washing etc. completer with toilets hand basins etc