Back then I was also packing lunches for my wife, and she wanted a bottle of commercial fruit juice to have with lunch. We'd buy a large bottle to save money and pour some into a smaller bottle for transport. I mentioned my experiment and she said "I'd like it if you had me try it with the juice" -- so I started doing it. A few days later she brought it up again, "Can we start diluting my juice I'm taking in?" and I told her she'd already been having diluted juice.
These days I fall into "water is the real adult beverage" but I always keep in mind just how sweet things are commonly made.