Bonking and liquid nourishment

Sometimes I get this bonking sensation early in practice: shakiness, a starved feeling, weakness, odd lights in the visual field (not migrainal here), dizziness--the kind of stuff I usually associate with low blood sugar. So I started eating a package of Lance ToastChee crackers before every practice, and I almost never get the bonking problem if I do so. Alas, now a new problem has emerged: just lost my final lower molar, which cracked down the middle like its three predecessor brethren. It's now hard to eat crackers (I can kind of hamster-chomp them with my incisors and other non-masticating teeth). It's actually hard to eat anything right now, given evacuated-tooth-related pain. My question: are there any forms of liquid nourishment that can take the place of solid food and provide enough of the right kinds of calories to let you swim without bonking? Note: William Faulkner was once advised that a diet of whiskey alone was not sufficient to sustain life. His retort: There's a lot of nourishment in an acre of corn. Alas, I have become a teetotaler and thus any recommended liquid nourishment must be of the non-spirited variety. Thanks in advance for your advice. BTW, diets that allow all you can eat of one specific food really don't work long term. I have been on the Ice Cream Diet for two days straight now, and I never believed how much I could grow to hate this foul cold substance.