At her 2yr check-up last month, our ped said dd should be getting 24oz of milk and 12oz of water per day. We don't offer juice at all, so that didn't really factor into his recs for us, though I have heard no more than 4oz per day, diluted with water to 8oz.
That said, getting 36oz of fluid into dd on a daily basis is a challenge, but we do the best we can. She has a sippy of water available to her at all times, particularly when we are out as we live in FL.