I'm with the others who don't think ICA could get it together to actually make chloroform. But I can imagine someone else making it FOR her. When I worked in chemical dependency we'd get a few young men every year who experimented with making their own substances, mostly combinations of existing drugs.
Heck, making methamphetamine is apparently simple enough. Young people find a new thing to get high off of about every six months, right? Now it's "bath salts"?
ICA obviously got some chloroform, but she didn't make it. Maybe she didn't even obtain it to use on Caylee, but as part of a sexual fantasy inspired by RM.