BCAA;s, Beta-Alanine, Creatine and something like Retain 2 to help control cortisol levels. Vitamin C helps with that too I believe. Purple Wrath and Green Mag would be a great start.
That's cool that you mentioned the vitamin C... good point.
If I were the way I am now, back during winter season and my coach allowed me 1 break every 3 hours, I'd tell him to lick the bacteria off of my taint at the end of practice.
These coaches and staff are retarded. It's no wonder why they aren't doing the exercise, but instead standing there with a dry polo shirt with a whistle around their neck and a Gatorade in hand. The town I'm originally from banned creatine from athletic teams. They say that creatine is deadly. I think in a way it's funny, but the pathetic nature outweighs the humor of these dramatisms.
All being set aside... baring these conditions in mind, I may have a solution for you.
1. Grab a 32 oz. Gatorade of your choice. Mix 3 scoops of Poseidon into the Gatorade.
2. If you feel like adding other aminos, sure that's up to you. Others mentioned citrulline malate, BCAAs, EAAs, Beta Alanine, or whatever. You don't need to, but if you have cash and want to enhance your performance add some to the Gatorade, or use a pre-workout drink like Ragnarok, Primed, or Ready for War before practice starts.
3. Get a shaker cup and Oryx Goat Whey. The flavor is awesome, it will not leave you bloated or tired, it won't cause allergic reactions associated with whey from cows. Much of Oryx Goat Whey is predigested. Mix 3 scoops of Oryx Goat Whey into the shaker cup and add 8 oz of water. It mixes extremely well and tastes amazing.
4. Find some kind of excuse to break for literally 30 seconds of practice, twice (ex. asthma). If you keep the Gatorade nearby and drink that during practice, you will be golden as far as hydration and electrolyte balance and glycogen.
5. You can gulp half the Oryx Goat Whey at the midpoint of practice and near or at the end. This will maintain the body with all that it needs.
6. Should you feel like addressing cortisol a bit better, you can either blunt it with insulin by adding some honey to the whey shake mixture, or investing in an ant-cort product (b-triol, 7-keto transdermal, Blaze, phosphatidyl serine, etc) and dosing that.
Best of luck!