So I've looked through the literature and I found a review article saying all of this and more. It was written by a group of respected physicians from American and French hospitals and it clearly supported the widely held belief that you should drink two to three litres of water a day.
This is a common occurrence to have your brood chamber become honey bound during the main nectar flow. A typical hive body will have a brood cluster in the middle and the outside frames will contain honey. A honey bound hive happens when brood begins to emerge, it is replaced with nectar.
A hive can be robbed out of it's honey stores in a day if there are many colonies in the area that are robbing the hive. Also a top bar hive is smaller in volume and a larger Langstroth hive(s) or tree colonies in the area. Larger colonies can quickly take over a smaller colony of bees.