Yeah, CARB really sucks. I've found that a hacksaw to that crazy bulb at the end of the spout works wonders. Theoretically, of course, but since I live in VA, I don't think CA laws apply.

Donkey dong (or another "D" word that is also a nickname for Richard) is a synonym for the GI funnels - runs about $20 on google searches. or use a super siphon (Bass pro and similar places carry them), about $5. Or check out DS tactical as they sell most accessories for the cans. As an FYI, the water cans still ship across the border. I don't know of anyone using them as gas cans, nor do I encourage it. The difference in handles (1 vs 3) aside, I don't know if the plastic is formulated the same.

I've had some luck w/ surplus stores. They don't often have the cans on display but if you ask around they might be able to pull out some.