You can get those suits now, the problem is that they require a water tank, pump system to circulate the water, a heat exchange system and power supply. Not something to easily where on a day-to-day basis and in most situations but IIRC NASA uses them in spacesuits. just like monty you get a tear in a line and the system fails. a quick search and you can get a vest version fairly easly for $300 or so with a backpack for the required equipment.
Why else would you do that, the only reason I recall doing it for was to fall or run into something and hurl. Of course, falling or running into something was an accident.
It is likely tea, but a quick search found several brands of instant coffee bags that look and are used exactly like tea, so it might be coffee look up Folgers Coffee Singles Classic Roast Coffee Bags.
It is likely a tea bag but if you look on Amazon you can get instant coffee bags, so there is a chance that it actually is coffee. I had to do a search just to find out if they existed.
If my book has a slip cover on it, I put it on upside down so that when I am reading in public it looks like I am reading an upside down book.