you can make a cheapo cartank with polycarb from US plastics that Big Fran mentioned and the 9307K39 -Push-in Flexible Rubber Grommet, MS 35489-93, an 931-C4-7, 1/4" ID, 5/8" OD from McMaster
check out The Best $3 Tank Mod You'll See Today to get some good ideas, just replace the CE2 with a...