The most suitable pot is ceramic. Glass is okay. It is important that your pot has a lid. Materials to avoid include cast iron and aluminums. Stainless steel is better than other metals. Teflon coatings are not as good as ceramic.
It should be drank warm or at room temperature. If the taste is so unpalatable that you can't drink it, water it down a bit. This helps a great deal. Also, it seems that after time the body begins to crave a certain formula, especially one that is well suited. The taste will become more and more palatable.
Generally, as a rule, it is best to take your herb tea 30-60 minutes before eating, on an empty stomach. This provides the best absorption of the ingredients. If the herbs cause a little stomach upset, drink the herb tea 30-60 minutes after eating.
Video for herb cooking: https://www.youtube.com/watch?v=M3U8LiFXack