I work 24hr shifts on an ambulance and can go long periods without having access to a fridge or microwave, I'm wondering if I can claim food expenses.

I work 24hr shifts and sometimes get held over closer to 30hrs. Some shifts I spend the entire period on the ambulance without access to my packed lunch, a fridge or a microwave to reheat or store food. I'm wondering since these prevent me from packing my own meal if it's possible for me to claim food and drinks I purchase at work. Most days I have no other option but to buy fast food or grab a pre-made salad at a grocery store.