I remember actually having the luck to do this in a public lobby with other people. I lied to them and told them that if they horde up all the spiders and let the red one drink from the 3 waters then we get a free perk. They followed the rules and when the spider was done drinking they asked "where's my perk?" I lied again and said you have to go through the spider boss cave and drink it from the purple water. All the 3 noobs went sprinting over there and they were like "I got widows wine!!!" "What? Me too!!!"

That gave me time to get the final piece for spider bait and then they were fucking amazed that a little spider was following them around the whole time haha. Good times.