Considering the policy, you are welcome to make of use the following resources to maintain a sustainable practice when organising an event.
Water Dispensers

One of the ways to avoid using disposables is bringing one's own water bottle for refill.

You may refer to the campaign website for more information, such as the locations of water dispensers in HKU, as well as rental or purchase information. 

*In light of the COVID-19 pandemic, all water dispensers in the public area of HKU are currently closed due to safety concern.