Opening the portal was not even the slightest problem. With the gate growing from the small seed to the size of proper doors, I grabbed a single vial with the miraculous liquid and stepped inside the portal.
After all, I had no way of knowing how did this thing to influence the content of the vial, so I wasn't going to risk moving it all at once only to find out that doing so would destroy the effects that it would bring to Eve! In the end, if moving those treasures through the portal would pose any risk of destroying or even damaging them, as much as I would hate doing so, I could still move them in a traditional way, by putting them all on a simple ship and travelling by the everpresent sea all the way back to the island of mine!