I made sure I had a big bottle of coconut water- amazing for rehydration and gives amazing energy. No matter how much water I drink on set, I seem to get bad headaches quite often, solution= coconut water.
I also made myself epic green smoothies to take with me on set, so if I was starving at 11am and lunch wasn't for another few hours, my smoothis filled me up, gave me an amazing energy boost and stopped my body and mind from being stressed.
I brought my own tea bags, organic green and other herbal teas. People on set gorge themselves on sugar and coffee to 'keep them going', which is totaly fine for them- this for me is like suicide- epic, I know but it's true :)
Just remember to keep calm and breathe. Sounds easy, but it's actually one of the hardest things for people to do on set. High stakes and high tension.
Breathe my sweets, breathe and enjoy what you're doing!!!
P.s- I also have my amazing grounding and calming stones with me on set- totally not for everyone- most people for that matter, but I love them so much!!!