bro i work all day and am away from home have no access to cooking stuff sometimes i boil up half a kg of chicken breast and mix it with some tinned tomatoes seperate it up into like 2 meals and take it with me the other meals I can make like easy a 600 kals mrp just throwin the blender protein powder/oats/peanut butter you can easy get 5-600kcals per drink make 3 of them for in between meals you got nearly 2000kals

peace
Jason