TNT... have you thought about mixing up unsweetened orange juice with water, filling an ice cube tray with the mix, and having that orange juice in your ice cubes?  Just thought about it,and wondered how it would work.

Your comment of unsweetened orange juice made me think of the 10 or 15 oz orange juice containers you see in the freezer section of the store, and I wondered how you would manage that in small quantities. Making ice cubes seems like an interesting way to go.