The milky looking polyethelene ? tubing may or may not be food grade but I am sure they have FDA approved tubing they may have just been covering their commercial butts. The much softer Plasticized Polyvinyl Chloride has the flexibility of rubber and the clarity of glass.
This clear tubing can come braded or plain and as stated here it is FDA approved.
http://www.menards.com/main/plumbing/rough-plumbing/pipe-tubing-fittings/tubing-hoses/vinyl-tubing/3-8-id-x-20-vinyl-tubing/p-1713706.htmPolyvinyl cloride

That's kinda like PVC pipe. I ran quite a bit of the ridgid stuff in my kitchen remodel for water lines.
This clear tubing also makes a great water level for home projects when you are trying to level large projects like a deck.