Hi Amanda,
You are a wonderfully creative daughter to come up with such a thoughtful Father's Day gift! Now I'm not sure if you're referring to the very popular
Blackberry Jasmine Iced Tea or the Traditional hot Jasmine Tea, however I believe I've tracked down both options for you. According to the Cast Member at Nine Dragons, the Iced Tea is purchased through a vendor by the name of China Mist. A quick google search will provide you their contact number and I did see a Blackberry Jasmine Tea offered on their website.
If you were hoping to purchase the traditional Jasmine hot tea, you'll want to contact the Disney Merchandising department at 877-560-6477 and request the loose leaf version to be shipped directly to you.
You should have just enough time to receive your tea shipment for Father's Day and I hope the two of you can sit back, enjoy and reminisce about your recent trip together.
Thanks for visiting us at the Disney Parks Moms Panel, Amanda.
Sherri