Changing my methods

[Kilix]

For a long time now I've been using a beach ball filled with water. It worked really, really well, largely because it was very sturdy and the odds of it leaking were slim to none. It did, however, take forever to fill and re-fill, which led to some laziness on my part when it came to actually emptying it. This, in turn, as many of you know, led to me having to throw it out after about half a year because it got moldy on the inside. Later thereafter I tried using just regular party balloons. They couldn't be filled up nearly as big and were extremely sensitive, so I disliked and feared using them. Now, just today, I'm trying a brand new method for the first time. I'm using a punch-ball balloon filled with water. Right now I'm just using a hair tie to keep it sealed, largely because I was too stupid to bring something else into the bathroom with me to seal it with. I couldn't let go of the nozzle without water spewing everywhere and the only thing close by was a hair band. So far it's working well but I fear the seal isn't tight enough, or that I blew the punch-ball balloon up too big.

Has anyone out there tried this method? And does anyone have any suggestions of what to seal the nozzle with that will allow me to re-open it easily to dump out the water, but also sturdy enough for me to lay down, sloshing the water over the nozzle inside the ball, and not have it pour out all over me?