Whatever we buy from the store, prep and cook up for ourselves. Meals on duty are our own (the crews) responsibility. In other words the city and department don't provide us meals. Typically there's a rotating roster of who on the crew is on cooking duty and they'll plan a meal, the crew (either the engine company or the ambulance) will go to the store, buy food using cash pooled from everyone (my station it's 8 bucks per person for dinner). If it gets too busy in the afternoon/ early evening to prep/cook it's not terribly uncommon for a crew to cut their losses and just eat out instead!
OK I did just notice your sameple paragraph...not too bad, though the second "Americanized" version does read better though there's still some regional slang, here it's the tones went off ("the bells bonged" sounds weird as heck to me lol) so no idea how exactly they'd word that in whatever part of the country you have in mind...if you can make the trip at all I'm sure they'd love to have you drop on by