I was looking into magsafe capped waterbottles to use as a monitor stand (holding up a USB monitor with a mag ring added), and found that Officeworks has got a Ringo branded one on clearance.
Equivelents are $35+ from what I could find from a quick search. You can get them slightly cheaper on Aliexpress if you really tried.
Anyways thought it was worth a share.
What about this - https://www.ozbargain.com.au/node/923859
Although I see the practicality of it doubling up as drink bottle. Looks like something someone would design and 3d print.