Having perused my well read copy of NOLS Wilderness Medicine (available e.g. through NOLS), there is no mention of hydrogen peroxide use at all. The only two things mentioned for wound cleaning are (1) water, and (2) water with povidone-iodine. Use of a syringe to irrigate the wound is strongly suggested. If you have limited clean water, rinse with untreated ...
The American Red Cross Wilderness First Aid courses in 2021 recommend irrigating wounds with at least a liter of potable water, using an irrigation syringe. If you don't have enough potable water, washing with non-potable water is acceptable and you should finish off with potable water.
The stronger antiseptic chemicals are indeed antiseptic, but ...
When someone is so badly injured that they need immediate professional medical treatment, and you are able to get them that treatment within a day, then wound disinfection isn't a priority. Infections take days to set in, and modern antibiotics administered at the hospital can prevent that from happening.
According to several first aid courses I did, trying ...
What you should keep with you is based on your trip but these are some essential things which you should carry.
Water (one gallon per person per day for several days, for drinking and sanitation)
Food (at least a three-day supply of non-perishable food)
Battery-powered or hand crank radio
Gps with extra batteries
First aid kit