What should I prepare in my travel bag? (detailed)

When traveling, we first prepare some daily medicines (for diarrhea and pain, as well as cold medicine), some snacks and instant noodles (in case there is nothing to eat), and soap if staying in a hotel. You don't need to bring a toothbrush and shampoo. We will also bring two bottles of water with us, or we don't need to bring them. We can sell it everywhere! ! ! Don't forget the camera, as if these are all basic.