If you're buying it bottled, make sure the cap is sealed. Tap water needs to be boiled for twenty minutes, not just brought to a boil. Do not use ice - most parasites and bacteria can survive being frozen. Yoghurt is apparently fine. It will be your only clean supply of blood if you get injured.
Westerners are extremely suspicious of traditional Eastern medicine.
Although I would question the medical benefits of snake blood and rice whiskey, traditional medicine has many herbs and roots that really do make a difference. Depending on your ailment, it may be worth a try.