This is an interesting point. I will try the lemon in the water and see how we go. I have tried the nappy watching when he was just on water instead of watered down juice, and found that he became quite constipated and there was significantly less wee. At present he has:
Brekkie: 8oz cup of milk (50% whole milk, 50% water)
Snack time: 4-5oz cup of diluted juice (75% water, 25% juice)
Lunch time: 4-6oz cup of diluted juice (75% water, 25% juice)
Dinner: 4-6oz cup of milk (50% whole milk, 50% water)
Occasional Nighttime Wake: 4oz cup of milk (50% whole milk, 50% water)