Since you can't always rely on finding streaming water in the mountains, we always have our portable drinking bowl from Ruffwear with us.
It weighs nothing and is easily foldable so that it doesn't take up any space in the backpack.
In addition, the durable material from the Quencher dries quickly. We usually hang it on the outside of the backpack with a carabiner so that we can have it directly at hand at all times.
When camping, we also use the quencher for feeding, so we have two of them with us so that the dogs can eat at the same time.