I have issues with prolonged water retention, bloating like I used to get for a few days during my period but now it lasts for weeks on end. So I guess I'm the opposite. I avoid salty foods when it's happening, and try to limit them at other times. Though I do buy lunch nearly every week day (sandwiches from places like Subway and Jersey Mike's) so I'm getting extra sodium from that.

BTW I think that menopause is defined as a full year without a period, so yes you're dealing with perimenopause now.

I ride a lot with men who are in their 60s and 70s, and they have a similar problem to yours (for a different reason). When I plan routes I try to have bathroom stops every 15 miles or so. That translates to roughly every hour/hour and fifteen minutes, depending on the rider's speed, which seems sufficient for them.

I hope you find a solution.