Water is essential to life, and it seems to be just as essential to TikTok! In fact, the wet stuff is a key theme on the Chinese social network with 1.7 billion users. The liquid even has its own hashtag, seen nearly 50 billion times, and there are endless recipes, trends and challenges based on water. But H20 isn’t always used wisely… Take vanilla or banana syrup, add candy or cotton candy powder, ice and then water, and you have the latest trendy cocktail riding high in a TikTok category called “WaterTok," the name of the hashtag used for posting…