I drink a 16-20 oz bottle of electrolytes (sugar free Gatorade, Propel, etc) as soon as I get up in the morning I'm fishing. Then I'm already one step ahead on the hydration game.
Next I have a cup of coffee and something to eat. Moments later, the deuce is done for the day and I'm ready to get on the water! I continue to drink another 80 ounces of electrolytes: Smart water, Lifewatr, etc. throughout the day... limiting the caffeine intake to 1 beverage seems to work.
Other guys I fish with don't do this so I buy them Dude Wipes (and even some repeat offenders a hat) for their birthday every year because inevitably they have to make a pit stop or do a #2 off the back of my boat mid day ?