I have the Brita Hub sitting on the edge of the counter so the kids can refill their sippys with a push of a button. Super easy and convenient.  You have the option to do 12oz, 20oz, or a random amount with the continuous hold of a button. It holds a decent amount of water and I’m filling it every morning. It does have a different feel to the water vs a reverse osmosis system but not bad or anything.  My only complaints are the Hub is loud in my opinion and I wish it made the water cold.