If you are going to complete the race in under 75 or so minutes, I wouldn’t bother with anything. Maybe a little bit of water from an aid station on the run. I might have a bottle in transition to take a sip from during T1 and T2, but only if it’s really hot. Otherwise, no drink, no gel, nothing during the event - you don’t really need it. Hell, I don’t even have a bottle cage on my bike for a sprint.
Eat a good breakfast (fancied up oatmeal works well for me) a few hours before, then take a gel 10-15 minutes before the start.
You also don’t really need to do this for 60 minute workouts assuming your meals and fueling outside your workouts are good. 320 calories in a one-hour workout is a lot. You should be able to get by with just water, or something like a Skratch bottle for 80-100 calories. If it’s a 90 minute workout, then start fueling like that, but you just don’t need 80g of carbs for most of the workouts in the sprint tri plan.