With summer vacation approaching, I'm worried about rough skin and split nails. Is there anything I can do?

The weather has been so hot lately that I haven't been able to exercise properly and have just been staying home. As a result, my skin is getting rougher and even my nails are splitting, which is really bothering me. I am especially worried because I am preparing to take a summer vacation to go to the beach or travel, but the rough skin and split nails make me self-conscious just thinking about taking photos. I heard online that taking supplements might help, and I am wondering if that actually works. I am not sure if the summer heat and sweat are making my skin and nails weaker, or if there is another underlying cause. Since it is vacation season, I am short on time for skincare, but is there any simple way to improve this? If anyone else has similar concerns, please share your experiences or tips!