A source close to Rubio tells BuzzFeed that the water bottles, which were sold on the senator’s PAC website to anyone who makes a donation of $25 or more, sold like hotcakes. In the period since they went on sale Wednesday, more than 3,100 of the PAC’s “Marco Rubio Water Bottles” have been sold.

“Send the liberal detractors a message that not only does Marco Rubio inspire you…he hydrates you too,” the donation page reads.