Woodwind accessories:

Clarinet:
Hite - Premier mouthpiece
Van Doren B45 mouthpiece or V 360
Rovner Ligature (our first choice)
Luyben Ligature (our second choice)

Saxophone:
Hite - Premier mouthpiece
Rousseau mouthpiece or Selmer C star
Rovner Ligature (our first choice)
Luyben Ligature (our second choice)

Brass Accessories:
All Trumpets and Trombones should have a "straight mute". 
Metal mutes are preferred.

Percussion:
All percussionists should have the following:
Stick Bag
Snare Sticks (SD 1 Generals by Vic Firth)
Timpani sticks staccato by Vic Firth
Mike Balter #14-R Red Yarn mallets for xylophone
Mike Balter #10 hard plastic bell mallets