Feedback on my diary?

I'm trying to healthily gain weight , im 5 foot 6 and eigh around 100-102lbs last time i checked. I'm really struggling with the idea of gaining weight because i love health food and i really don't want to be fat. Any ideas/suggestions on how i can sloly and ideally healthily up my intake without feeling bad that'd be great. I was thinking i could start with 1 cup of alpen instead of the recommended half cup? is this the sort of way to go?