Coffee in the morning, if I'm cutting weight I'll take a 200mg caffeine pill with 25mg of ephedrine around when I would start getting hungry for lunch. In terms of energy drinks, the new "bang" and "REIGN" drinks have the most caffeine per can and usually are BOGO somewhere, although i wouldn't put any merit in the BCAA/Creatine marketing.
I usually drink a meal replacement product for lunch if I don't remember to pack something to eat and I pretty much always drink at least one on my doubles. I thought the Soylent shakes were okay depending on the flavor, but I currently use Huel which is another total daily nutrition shake system type gimmick. Huel is an acquired taste, it has a large amount of ground up oats in it so it tastes a bit like, well, oatmeal. Its quite filling, has a great nutritional profile, and can be flavored to your liking with your own additives (cocoa powder, cinnamon, ect) or the company now sells flavor shots which I haven't tried yet.
There's a ton of companies that make meal replacements now in multiple formats (powders, premixed bottles, biscuits/bars, ect) your best bet might be to try to sample a few and see what works for you. (Jake, Huel, Soylent, SuperBodyFuel, Hol Food)