I am trying to stat out my desert elves for RMU and I find that I need a couple of non-standard talents. Adapted to the desert, they are capable of handling high temperatures (but are as burnable as anyone else when subjected to fire) and can endure without water longer than most humanoids. So, I'm sharing them (a) because someone else might find them useful and (b) because I welcome feedback regarding wording and cost.
Heat Tolerant: Those with this talent can handle higher temperatures than others. If the temperature is higher than the optimal temperature range, treat the temperature as 10 degrees Fahrenheit (or 5 degrees Celsius) per tier lower when determining the effect of this heat on the individual with this talent. 1 DP/Tier
Drought Resistant: Those with this talent can go without water longer than usual. For each tier in this talent, one day without water since the last time drinking one's fill (or being on regular ration for at least three days) is not counted as time without water. Similarly, two days of half rations of water may be ignored. 2 DP/Tier