With a standing mixer or a hand held mixer, beat the cold water and sweetened condensed milk in a medium sized bowl until well combined.
*I use 2 bags of Pepperidge Farm Chessman Butter Cookies. You can use other butter cookies or shortbread cookies, if you prefer.
**Use a quality white chocolate bar, like Ghirardelli. Don’t use white chocolate chips, because they have other ingredients in them that cause them not to melt properly.
***You can serve this right away, but chilling it in the fridge for at least a couple of hours (or even overnight) will allow the cookies to soften a bit.