All you need is one text event. For !jb applejuice and !jb orangejuice, they have the exact, same message, the orange juice should have been "orange juice." Finally, you need a trigger control so that the client running the code doesn't get spammed or flooded.

This is my method, which saves quite a few bytes compared to BrandinA's:

on $*:text:/^!jb (sprite|pepsi|beer|drink|tea|lemonade|share|(apple|orange|promegrant)juice)\b/iS:#:{
  if !%f {
    inc -u4 %f
    goto $regml(1)
    :sprite
    msg # Sure sir; That'll be 3.50.
    describe # mixes the drink.
    halt
    :pepsi
    msg # Sure sir; That'll be 3.50.
    describe # mixes the drink.
    halt
    :beer
    msg # Sure sir; That'll be 4.50.
    describe # gets the beer out of the fridge.
    halt
    :applejuice
    msg # Sure sir; That'll be 2.50.
    describe # gets a bottle of Apple Juice.
    halt
    :orangejuice
    msg # Sure sir; That'll be 2.50.
    describe # gets a bottle of Orange Juice.
    :drink
    msg # Sure sir; your $2- shall be 1.00 per ingredient.
    describe # gets everything out and mixes everything.
    halt
    :pomegrantjuice
    msg # Sure sir; that comes to a total of 4.50.
    describe # gets everything mixed.
    halt
    :tea
    msg # With milk, thats 2.50; Without, its 2.00.
    describe # gets the tea ready!
    halt
    :lemonade
    msg # Thats 2.40.
    describe # gets the juice container with lemonade out.
    describe # pours the lemonade into a glass.
    halt
    :share
    describe # hands some of the $4- to $3.
    msg # Like it?
    halt
  }
}