Apparently, when he goes off round the world in a plane, or perhaps a boat, Mika always takes his own tea with him.
I think we're meant to read this as being "quirky and particular" rather than putting him in the same bracket as those people who go abroad for holidays with PG Tips and Heinz Baked Beans in their cases because foreign food is "funny".
Mika, it seems, is a tea pedant:
Handy skill, making a perfect cup of tea - and one that guarantees Mika will continue to be in demand in the music industry for years to come. Two sugars, please.