This is the water filter Sophia and I made for our design challenge. We were only allowed to use items we would find on a deserted island. We used straw mats, and pieces of cloth as our filters. I think overall we did quite a good job. We tested it out first, but it had a leak in the bottle, so we worked on it some more, made some changes then tried it out again. We think it worked quite well, but there are definitely more adjustments we would make if we had more time.