It depends on what you've been doing the days before training wise, what are you doing the days after training wise, and if you feel hungry. A 25mi group ride simply isn't going to be able to deplete your energy stores all on its own, but if you're depleted from previous days and you've got more training coming up the following days, you need to make sure you're keeping on top of stuff. If this is like one of 3-4 rides you're doing in a week it matters much less however. I dunno, maybe you're heading out the door and you're a little hungry, just bring a dang cookie, it's ~100 grams tops, it isn't going to get you dropped.
There isn't any harm in bringing more water than you think you'd need along with a snack. The worst case scenario is you don't finish your bottles and you eat the food after you finish or save it for the next ride. I'd rather have too much water than too little.