Most powerlifting sessions do not need anything more than water. But when the work gets long and heavy, what you take in during the session can be the difference between finishing strong and falling apart on your last lifts. Intra-workout nutrition is a tool. You just have to know when to reach for it.
When You Actually Need It
If your session runs under an hour and you ate beforehand, water is enough. The case for fueling during training shows up on the big days. Long squat and deadlift sessions, high volume work, or a meet day where you are at the venue for hours with heavy attempts spread out. Those are the times your tank can run dry mid-session.
What to Take During a Session
Keep it light on the stomach and easy to use. Fast digesting carbs are the main tool, sipped through the session rather than dumped in at once. A carbohydrate drink, diluted juice, or simple sports drink works well. Some lifters add a few grams of free amino acids if the session is very long, but the carbs do the heavy lifting.
Avoid fat and heavy protein during training. They sit in your gut, slow you down, and can leave you sluggish under the bar. Save the steak for after.
Meet Day Is Where This Pays Off
A long meet is the clearest case. You might warm up, wait, hit three squat attempts, wait again, and still have bench and deadlift ahead of you. Sipping carbs and staying topped off across that day keeps your energy steady so your third deadlift attempt has the same fuel behind it as your opener.
Test your intra-workout plan in training first. The worst time to find out a drink upsets your stomach is between attempts at a meet. Practice it on your longest training days, then run the same plan when it counts.