Dextrose. You can't buy it in grocery stores, but it is available online. Don't pay more than $2/lb. It is sold most cheaply labeled "corn sugar", marketed mainly to home beer brewers. There is only one actual supplier in the US, who ships 50 lb bags. Others break it up and sell 10, 5, and 2 lb bags. Some relabel it "dextrose" or "glucose" and jack up the price. I get mine 10 lb at a time from "Homebrew".

Regular sugar (sucrose, fructose) is poison without accompanying fiber, and is the cause of the US's (and India's and Pakistan's) epidemic level of "metabolic syndrome", liver disease that, indirectly, kills way more than COVID. Your liver can neutralize small amounts, as it does alcohol, but Americans take in way more than it can process. When your liver is impaired, you die from things a healthy liver would have prevented. (Really, nowadays people who don't drink are dying from cirrhosis!)

So, you can use dextrose anywhere you would have used table sugar. It has the extra advantage over table sugar (besides not being poison) that it does not make you more hungry after you eat it. Note, it is on you to ensure there is fiber in whatever you take in at the same time; without fiber it (like table sugar) causes insulin excursions you are much better off without. Coffee and cocoa have surprisingly large amounts of fiber.

For more about metabolic disease, the best place to start is youtube vids of presentations by Robert Lustig, a respected endocrinologist specializing in liver disease. He has several books out, most recently "Metabolical", that you probably can get from your local library.