Since my teas started tasting strange, I found that the problem was this:
The longer I kept hot water in my simple thermos, the worse the taste became. The inside is made of glass... but the lid is made of plastic. Probably the plastic contact with the water steam leaves all the water you put in with a terrible plastic taste.
Before I thought about the plastic lid and thought maybe my kettle was the problem, I decided to buy one of these:
It's a poor brazilian's Zojirushi-wannabe electric water boiler. As you can see, the top inside part is also made of... plastic. I ended up having the same problem with this one
Any cheap solutions to this problem? Any thermos you can recommend on ebay with worldwide shipping? Thanks!