Your body is having to detox from the sugar, sodium and caffeine.
Your goal is to get the color of your urine to be almost colorless or a very light yellow. The dark brownish yellow is an indication of severe dehydration.
I do not work outdoors, but I do sweat a lot. I have to drink about 80 ounces of water a day to keep my urine color in the good hydration zone. With that, I probably pee 4 or 5 times in a 24 hour day.
Since you work outdoors, I will bet you need a larger volume of water. About 70% of your fluid intake should be water.
Do you take daily vitamins? If not, consider it.
When is the last time you saw your doctor and had a physical? Been checked out for prostate health?
Get a check up, if for no other reason than to get a baseline picture of your current health status so you can measure the benefit or lack of benefit from changes you make in your nutrition.