You should continue to drink water between your meals to remain hydrated. It is suggested that you continue to drink 4 to a maximum of 8 ounces every hour so that you consume a minimum of 64 ounces per day. At least half of the daily fluid intake should be water. Do not rely on your thirst to guide your fluid intake.
You can expect to feel hungry at times. Hunger is a natural feeling and should not be consider abnormal. Since you are not drinking protein supplements continuously, it may be a good idea to use the protein shakes as a snack between your meals as you did during phase 2 of the post bariatric meal plan. Also choose nutrient dense foods that will provide a feeling of fullness without too many calories or fat grams. An example would be a single serving of hummus and carrots, 4oz. of a low fat or fat free yogurt or cottage cheese with ½ cup berries. The latter will add flavor, fiber and vitamins and minerals to your snack.