Sure, you could, but I've always found the carbohydrates in FINiBARs and Surge Workout Fuel* to be superior for athletic endeavors.
It's up to the OP to balance out on-the-field results with what it costs to fuel them. If you're ultra-competitive and take your rugby seriously, then opt for Surge Workout Fuel. If you're a weekender, then maybe Gatorade will suffice. But then again, you may want to be the ultimate weekender.
*My experience with Surge Workout Fuel was limited to pre-workout in the past, but FINiBARs have proven to be wonderful.