Update before heading out. And use every chance you get near civilisation to update.
Keep a USB drive with a bootable EndeavourOS ISO with you. Write your username and password for this forum on a piece of paper. If you have internet access but you mess up your system, you can use your ISO image to browse the net and come here on the forum to ask for help.
Alternatively, if you think you won’t have the time and willingness to do troubleshooting while you’re away, update now before heading out, verify everything works fine, and just stop updating altogether until you’re back. Everything will continue to work fine if you do not update. Then, when you’re back, you can deal with any issues that may arise from you not updating regularly. It probably won’t be too bad and we’ll help you out.