I've never thought about this issue. I'd probably bring plasma fruit and grow perfect quality before traveling (it helps that I modded the plants.xml file so plasma fruit plants yield more fruit before dying).
Or, I'd do the Abu Simbel tomb first and use the Right and Left Eye of Horus to teleport back to base camp to raid the fridge for plasma juice when needed.
Another difficult supernatural would be mermaids. They dry out quickly around fire and the shower-in-a-cans don't work for them, not to mention the salinity requirement which can't be met in France (AFAIK there's no place to swim on world lot water there). I'd probably rely on the Eyes of Horus to be able to teleport to a shower quickly just in case.