Ah - the site's tutorial mostly discusses 1/2" tubing, but does say: "1/4" tubing (vinyl and poly) also comes in different sizes however, even different sizes of 1/4" tubing will usually work together." It also recommends that poly is easier to attach to barbed fittings, so I'm going with poly.
The fittings themselves specify that they fit tubing with .156" ID; but the poly 1/4" tubing they sell is .17" ID. I think I'll be OK being off by about a hundredth of an inch... in any case, the barbs themselves are .22", so it should hold fine.
I'm ordering the tubing, fittings and the shut-off valve from dripdepot.com; I'm getting the mini-float valve and 1/2"-to-1/4" barbed elbows (to hopefully connect to a 1/2" grommet on the main reservoir) from usplastic.com. I couldn't find the white nylon elbows specified in the InnTainer guide from either of these sites, so I'll give these a try first. I'll be back in a couple weeks with some pictures of the construction and testing!
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