Ok here's a few suggestions.
Instead of wrap with sandwich filler wishing is likely to be full of Mayo and sauces which add loads of calories how about filling the wrap (wholewheat or seeded rather than white) with:
- chicken breast pieces and salad or low fat coleslaw
- tuna and salad, low fat Mayo, sweetcorn
When you need to eat at a cafe/fry up type place just think about the make up of what you have on your plate.
Typical fry up - 2 rashers of bacon (110) 2 sausages (222) hash brown (140), fried egg (90), black pudding (95) fried bread (141), beans (187) mushrooms (44) - 1029 calories total.
You could have 2 slices of toast (240), with margarine (30) and 2 fried eggs (180), total 450 calories
Or
2 slices of bacon (110), double mushrooms (88), fried egg (90) and beans (187) for 475 calories
Or bacon and egg sandwich - 2 bread (240), 2 bacon (110), egg (90) - 440 calories.
Good low calorie snacks you can keep at ambient temperatures include things like beef jerky, boiled eggs, fruit, vegetables.
Could you get one of those travel kettles that plug into the dash for pot noodles, pasta mug shots, instant soup?