I've worked in respiratory for 9 years and this question of camping with a Cpap comes up a lot. Some of the best options came out in the last few years with small travel cpaps that don't use a humidifier. Heating the water uses a lot of electricity so by using a closed system with a special filter allows your own respiration humidity to maintain a tolerable level of humidity and saves electricity/battery time. Here's a good option on the market that utilizes this system. Lots of good, lightweight battery options on the market to go with this.
AirMini is a small portable CPAP machine from ResMed that provides quality sleep apnea treatment for travel or home use.
www.resmed.com
Second, I'm not a huge fan of the mouth guards. There is not a ton of data and reputable studies that prove the efficacy of them. The fact that they are prescribed by dentists and not a sleep doctor or Pulmonologist says something. There's rarely (Polysomnogram) testing for these mouth guards that proves any diagnosis of obstructive sleep apnea, or any testing post fitting that proves an improvement in a reduction of apneas. Another big indicator that this is not a fix for the problem is that I don't believe your insurance can be billed for these mouth guards, so most pay out of pocket for this treatment.
Talk to a primary doctor if a person feels as though they've got any symptoms of sleep disordered breathing. (Morning headaches, hypertension, chronic fatigue, a-fibrilation, and a host of others, and also snoring being a relatively small part of the picture)
However, in personal experience in duck camp a few years ago my buddy forgot his snoring mouth guard. The entire shack could feel his snores in the floor boards. Next night there was absolutely no snoring with his guard in. (Less booze the second night was a big factor to lol).
If the goal is long term health improvements and better sleep, look into a CPAP. If your goal is respecting your camp buddies, or getting byWithout electricity a few days, a mouth guard might be a nice option.