*Update* Ok Wes had mentioned if the braids leak as the water seeps through and I responded by saying that the water evaporates before the braids can accumulate enough water. WRONG! It leaked a bit but luckily I caught it in time. Check last pic to see my perfected system

Cut braided cotton rope into strands approx 2 ft.

Tie a knot in the middle.

Insert the knotted end in the jug.



Arrange the strands evenly around the jug and you should have something that looks like this.

And Voila! That simple!
I know that setting an open bowl of water may have the same effect but I find that this method provides more room as it places most of its mass vertically with more or just as much surface area to evaporate. Not to mention you can control for spills much easily.
Actually, you have to wet the strands first before you put them in the jug filled with water. They will act as a wick and continue to suck the water up as the water evaporates from the strands. Of course the amount of humidity is relative to your already ambient humidity, how small your space is etc.

Whatcha think?