Hi,
An important thing to bear in mind is that a water infection is not necessarily painful for a man (as it often is for a woman), so it might be a good idea to have that checked periodically if you’re wearing pads.
The others on here have given some very good suggestions, including increasing your pelvic floor exercises.
As for your trip, I can’t speak for your son, but I’ve arranged as many getaways as I can with my OH. Since I live with him, and do our washing, I understand the difficulties of incontinence. I plan ahead to minimise the stress from that. We’ve had a few near misses on walks when I hadn’t properly mapped out where the toilets were — which turned out to be in very public and open places. Lesson learned! I now try to check routes in advance to see where the toilets are, and keep supplies and coins ready just in case. I also ordered a portable urinal in case it’s ever needed while we’re out.
I imagine your son just wants you to have a lovely time together, but that will only happen if you can relax and enjoy yourself. Perhaps tell your son about your difficulties, worries and stresses, so he can plan everything you’ll need to make it a really nice trip for the both of you.