Prouboy makes an excellent point. Don't know if that was GeoFisher's problem, but I bet it effects people more than they realize.
 Assuming your not on meds, certain vitamins, the easiest way too see if your dehydrated is by the color of your urine.
 PEE clear, means your well hydrated, when it starts too turn yellow/dark yellow, it's concentrated, and your dehydrated.
 A good habit too get into, is drinking a big helping of water FIRST thing in the morning, before you have your caffeinated beverage. Caffeine is a diuretic, if your already borderline dehydrated first thing in morning, drinking caffeine alone, just adds too he problem.
If your drinking adult beverages in the evening, the alcohol helps dehydrate you as well. Some people drink little in the evening because they don't want to make a bathroom trip. That's a mistake as well. Being dehydrated can effect your sleep and how warm you stay. Bring a P-Bottle with you if you rather not wander out in the bush.
 I think you made the right call with the the responsibility of your daughter, her welfare comes first. If I were alone, and drove all that way, I would probably try and stick it out, but that's easy too say from here.