Yes. #2 plastics are the only thing to use with highly basified solutions.
Someone told me that the 5 gallon, distilled water jugs from the grocery store were a good thing to use. I went out and spent the money for one and went aheard with my mescaline extraction. Two days later, the jug had a big crack down the side and I realized that the plastic had become extremely brittle.
Fortunately, I was able to transfer all the gunk to a new container before it leaked all over the floor. I looked at the bottom and there was a #7 in the HDPE triangle.
Always check. And always use #2 HDPE!!!!!!!!!!!
Milk jugs and Sunny Delight bottles offer a nice tapered shape to work with.