Drinking the water from the tree stand is not safe!

Some things to keep in mind...
Be sure to cover the tree stand as well as the water in the stand may absorb tree sap which can be hazardous to a cat's health. Also if the cat drinks from the stand it risks ingesting pine needles that might have fallen in, which can cause serious gastrointestinal problems. Don't use additives in the water as they may be toxic.