I am more concerned about what to feed them BEFORE games and practices. I like to give them healthy , energy producing foods and stay away from sugary , unhealthy food and drink.
Afterwards , its usually bedtime or meal time , so I feed them whatever we would be having at those times anyway. I don't worry too much about what they eat then. Although I do limit unhealthy choices at those times too.
My kids also drink lots of water , gatorade eat oranges , pretzals , etc. during practices and games.