You can refill your Bottle without Bottle crowing or going back to your fountain. To do this, immediately give your Bottle to an Ally who has teleported near you from a fountain. This fills your bottle, due to the fountain buff lingering briefly after after the other player has left the fountain. Use a TP scroll, Keeper of the Light Recall, Nature's Prophet Teleportation, or recall on Lone Druid Spirit Bear to help refill an ally's Bottle.