I noticed a lack of rules for starvation and dehydration in SWON and came up with these, adapted from the D&D Cyclopedia:
1) Starvation sets in after three days without food.
2) Dehydration sets in after one day without water.
3) A character takes 1d2 damage per day without food.
4) A character takes 1d8 damage per day without water.
5) A character takes a cumulative -1 penalty to attack and skill rolls per three days of starvation.
6) A character takes a cumulative -1 penalty to attack and skill rolls per day of dehydration.
7) A character acquires 1 point of system strain per three days of starvation.
8) A character acquires 1 point of system strain per day of dehydration.
9) A character cannot heal naturally while starving or dehydrated. System strain will not be reduced by rest.
10) Damage caused by starvation or dehydration cannot be healed while a character is so deprived.
11) Ingestion of adequate amounts of food and water will stop further damage but the character will will have to heal the damage taken and must rest as normal to remove system strain.
12) Attack and skill roll penalties are removed by one per day as soon as the character is adequately fed and hydrated.
130) As always, subject to GM fiat.
The moral is:
1) Don't be caught without a stillsuit on Arrakis.
2) Take plenty of food if you go camping on Eden.
3) Try not to get marooned on Mars.
+C.T. McGrew Grrr! Why didn't I think to look in my copy of "Other Dust"?
+C.T. McGrew I'm not entirely sure I like the rules in "Other Dust" but they're as close to official for SWON as it gets.