Dense foods with high calories.
Nuts, eggs, whole milk, fatty fish, beef, fish oils, nut butters. hell a glass of milk and a PB and whole grain bread sandwhich could easily be 1000+ k/cals.
Add in a serving or 2 of Surge which is digested easily and fast around w/0 theres 350-700..
Rice maybe look at Chanko
YOU CAN DO IT