like if they sold shit at stores or something like round pieces of ice with holes in em, you could use those as ice catchers.. just slip the round piece of ice into the tube and it should float on the water, then just drop ice on top of that and you got an ice catcher heh
http://www.grasscity.co.uk/img/products/diy_ice%20notch_spacer.jpg Or you could make/buy that as an ice catcher