@s1m0n4@ohai.social
This depends on many conditions: Weather, time of year, daily form, time of day, training workload, and what exactly is “a long distance” for you ...
Normally, in normal weather, I take some water with me for distances over 20 km, water is the most important thing for me. I never take gels or similar during training, no matter how long the route is.
I also always take a small flask (250ml) with me for official races lasting several hours, even if there are refreshment stations, and Squeezy Liquid has proved its worth for me personally. A sip once an hour and that's it.