Indeed. Don't under mind the power of Tre's guitar that he uses. As with any artists, it is almost impossible to emulate anyone as each player's own touch (including your own) is very different.

Tre plays a custom guitar made by Phish soundman Paul Languedoc. Bassist Mike Gordon plays a bass made by the same luthier. You can get your own Languedoc at the link below. These are not cheap and I believe the wait for them is quite a long period of time as well;

http://www.languedocguitars.com/

If you like Phish, please check out these other bands as well;

Umphrey's McGee
.moe
The New Deal
New Monsoon
Yonder Mountain String Band
The Derek Trucks Band