How to get rid of water weight?

I'm trying to get rid of this water retention in my legs—they’re pretty swollen and have some sores on them too... anyone know any natural ways to handle this besides just drinking peach tea?

There are certain medications specifically designed for that purpose that your primary care physician could prescribe for you.

Yeah, I know about Lasix... but we're dealing with an older person who can't stand them, plus they can't exactly be running to the bathroom constantly because of other issues going on.

Look, I’m not a doctor and I’m definitely not licensed to give medical advice. This is just my take based on some trial and error and stuff I've picked up on my own.
You could try going low carb—specifically keto—since it has a diuretic effect. Basically, slash the carbs and load up on high-quality fats. Just make sure you stay hydrated and keep your electrolytes in check: potassium, sodium, magnesium.