Well I would lean toward downing a serving of Surge before hand because I can stomach it easily during a w/o as opposed to something that contains lots of more complex carb, pro. and fats and then hit something more substantial right after your w/o. It also really seems to give me a good dose of energy for the w/o as well.
But that is just me. If you can load up and still w/o with intensity without getting sick go for it. Some ideas. I have had to make shakes for my mom to get some calories down her mouth easier and find a lot of things handy.
For fats oils, nuts, cocnut, etc..
Protein well usually Grow! also milk cottage cheese and occasionally eggs.
Carbs Fruit, oats, instant Potatoes work great as does instant rice. Those last two for sure reserved for those whom are looking to pack on some mass but they load up the carbs and cals easily and dont mess with the flavor of the shake.
I dunno and example would be say
1 cup of milk
1 scoop of Grow!
1 cup of oats
1 Fruit ( apple , cup of berries, banana, etc.)
1/4 cup nuts of Tbs of oil
This simple shake would give between 5-700 cals depending on the type of milk type of fruit, nuts and or oil. A nice dose 30+ of Protein, fats 15+ good fats, and a whoppin dose of complex and more simple carbs to fuel you for the short and long term.
Easily adjusted up or down to fit your own needs.
Just experiment, you are sure to find all types of combos that work
Hope that helps,