Citi Field tried to glom onto the viral “999 Challenge,” in which baseball fans gobble down nine hot dogs and nine beers in nine innings — but my attempt to devour the Opening Day experience left me filled mostly with disappointment familiar to Mets fans — and not nearly enough beer. I volunteered for the food-centric feat in the name of journalism, of course. But the laughably small 2.5-ounce beers and teeny weenies caused mostly a bloated, thirsty feeling — and I was barely able to catch a buzz.