Huh! Just took a look Deathbrewer's system - it's pretty nifty!
If you're looking at batches that small though, I have an idea that I've been wanting to try for awhile now. Get a thermos (make sure it's at least 1.5-2L capacity) and mash in like you would normally (my general practice is 2.5L liquor /kg malt, mash around 65C for an hour). Once your mash is done, take some cheesecloth and hold it taut over the top with a rubber band; invert over your boil pot (or interim vessel) and drain. Then remove the cloth, toss in your sparge water to hit around 75C and let sit (10-20min), replace cloth and drain again (I usually rinse the grains twice with batch sparges). Then treat it like you would any other all-grain.
Since it's such a small batch cooling wouldn't take long, but if you wanted to speed it up you can use those reusable ice-pack things - submerge it in your sanitising agent first (I just use bleach for homebrewing, and then a quick rinse - I'm cheap

) to sterilise, and then toss it in your boiled wort.
With this system, you'd only need one pot, and some kind of interim vessel if you're boiling your liquor and then your wort in the same pot. Like I said, I've never actually tried this, but it seems to me it'd be perfect for a little 3-4L batch!