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I make sure I’m well hydrated all the time so I only take water with me if I’m going to be out for over an hour, unless it’s very hot. For HMs and distance training in hot weather I tend to use just water or fresh fruit juice diluted with a pinch of salt added. I have used hi 5 zero tabs too (but they do have sorbitol and sucralose in them).
Just realised this post is an old one which just appeared as a new one – don’t know what happened there 😮