Hello , can one please explain to me how best to install a reservoir for the cooling water ?? I should actually only know how big the container should be and how to attach the hose..???? I thought I can just let the cooler hang the cleverly in a container so almost to the ground ..!! Through the heat then the container is filled and when it cools the water is pulled back through the vacuum into the cooler !!! Did it have to fold or ?? or should I attach the hose down to the container ???? Many DAnk for your tips Grus achim