5 small meals spread over the 12 hors day is recommended. With such a meal plan, when to take water ideally?

I am 72. I was a high sugar diabetic. A month back, I have been started on a medicines package of
FORMALIN TABLET, delayed release aspirin tablet, lipidone tablet and fish oil capsule omega-3 and B12 tablet. Now my
blood sugar ranges witin normal permissible levels, pre-food, and 2 hours after food. Hitherto,
I was taking morning 7 AM breakfast, 12 Noon lunch and 9 pm dinner (vegetarian). I used to take
1 and half liters of water at 3 pm. Now, some health specialist' 5 small meals a day prescription
I want to experiment on myself. But, the prescription was silent about the time when I should
take my daily dose of 1 and half litre intake of water. Hemce, I seek your valued counselling.