Have you thought of getting a small lixit water bottle for the travel cage? Here is a link. https://smile.amazon.com/Lixit-Wide-Mouth-Bottle-10-Ounce/dp/B0002Z162Y/ref=sr_1_22?crid=FKU2UNOPMY1H&keywords=lixit%2Bwater%2Bbottle&qid=1655326677&s=pet-supplies&sprefix=Lixit%2Cpets%2C179&sr=1-22&th=1. I haven’t actually tried them myself but they are pretty popular