There is a really good sticky on here about using different kinds of juice. Check to see if there is potassium sorbate added to the cider also. It is a preservative that hinders yeast reproduction. It can be overcome but will add some more steps to your production.
I have a gallon of mead that I made with raspberries and blood oranges and I am going to rack it hopefully this weekend. I am sure I will have to top off the secondary and I was thinking of using some strong green tea. Has anyone else tried this? Should I just use boiled and cooled water to top off?