I have a printout of a good article that unfortunately is no longer on-line. To summarize;#2,
#4 ,and
#5 are the safest,
#1 and PLA are ok.
#3 ,
#6 ,and
#7 should be avoided. Most of my water bottles,even the cheap freebies from Bike to Work Day,are
#4 .
FYI,Klean Kanteens are made in China,Sigg's are made in Switzerland. I trust the Swiss,none of my SAK's have had lead in the paint or have been made from banned metals.