snacks and mini meals?

Howdy!!!! So, I am kinda stuck with my eating situation.... my job has a very weird schedule so snacking or having mini meals isn't always easy to do. I work on a special ed/ preschool bus and my hours are Monday Tuesday Thursday and Friday 6am-9:45am 10:45am-1:15pm 2:00pm-4:45pm... and Wednesday 6:00am-9:45am 10:30am-1:00pm 1:30pm-4:00pm...so In the morning when I get to work I have about 10 mins or so to do whatever I drink a Boost Glucose control shake (190 cals) then when i get home at 9:45 I either make a turkey sandwich with veggies, pringles, or cottage cheese (roughly 300cals depending what I add) or 2 scrambled eggs with a little bit of milk (add salsa, hot sauce, crushed red peppers) 2 or 3 pieces of turkey bacon and natural applesauce or reduced fat cheese (roughly 300 cals) then I take a Kashi granola bar with me (between 120-140 cals depending on flavor) but then I starve till dinner and usually over eat. My question is what is a good stable snack I can take that doesn't need to be cold or hot, and can't contain nuts? (some kids may have allergies so they dont really like for there to be nuts around and they are forbidden in the schools) also I am NOT the driver I am an aide which means i am in the back with the kids. Also I am prediabetic so I really have to watch my sugary foods so even though i love bananas I try to steer clear. Also, since I am on a bus there aren't very many potty stops so chugging water to feel full isn't really an option, I drink MAYBE a total of 20oz of a beverage between 6am and 5pm....Thanks for reading this long post and thanks for any helpful tips or hints.