I'm a new runner. This year I've run several 5ks and 2 10ks. Trying to build to a half and hopefully a full marathon one day.

What do you do to warm up for shorter races? The second half of the race is always easier than the first for me. Could a longer (harder) warm up help with the opening miles?
Do you carry water on your long runs? What would you recommend to use to stay hydrated on longer runs? Drinks, bottles, packs, etc.

I would like to try the Hornet Juice.

Thanks
Bishop