Using this you can refill the use amount of items from the drink zone.

Add the highlighted nodes shown in the image below, location at the top of the image.

Next go to the BP_MasterInventory and create a new function called FindNotFullUseAmountItems and add a new input called ItemIDs and set it to Name type and set it to an array.

Then add a new output called FoundItem and set its type to Boolean, then create another output called ItemSlot and set its type to S_InvSlot.

The copy the image below.

Next go to the BP_PlayerInventory and create a new function called PlayerFindNotFullUseAmountItems and add a new input called ItemIDs and set it to Name type and set it to an array.

Then add a new output called FoundItem and set its type to Boolean, then create another output called ItemSlot and set its type to S_InvSlot.

The copy the image below.

Next create a new variable called FillItems and set it to a Name type. Then set it to an array and tick on Instance Editable. In the default values you set the item ID of any item you want to be able to refill from the drink zone such as the Consumable_WaterBottle. Then copy the image below, location at the top.

If you dont know how to find an items ID, it here in the ItemList.