Little late to the thread, but I just had a really good experience with liquid IV as a couple others have mentioned. In August, I was at ft Rucker, Alabama for school. Needless to say, it was hot hot. Throughout the days that there wasn’t much physically demanding events, water worked fine. But I did see a lot of people fall out of runs and rucks because they were not prepared on the day prior to the long runs or ruck marches, I would drink two Liquid IV packs. The day of the event, I put one in my camelbak. It worked well for me. I felt hydrated through the course of the events and never felt “weak” or “shaky”. The bit of sweetness was a nice booster too. I would feel confident that it would work in the conditions that you mentioned in addition to you already taking steps to stay on top of your health.