Below is a picture of a very simple arrangement for mashing. I got a chilly bin (~55 Liter), some hose that I made lots of small cuts in and an old shower hose (just the metal, without the internal hose). I connected them together and then pushed the hose into the tap.
To improve the filtering a bit I cover the hose with a cheese cloth and weigh it all down with a small stainless grill (from the oven) . And then it is just a matter of adding malt and hot water.