In the wild when the tourism can not find clean water can bring a few clean bags of convenience, easy to do a simple water filter for water filtration, production methods are as follows:

First, it is necessary to carefully check the bag: to ensure that no water leakage.

Second, do water holes: in the corner of the bag to open a hole for filtering water holes.

Third, to do filter: a few clean and tasteless paper towel to fold, folding several layers can be used as filter.

Fourth, the combination: will do a good filter plug into the filter hole.

5, filter: the need to filter the water into the filter hole, with the filter to filter.

The above is a simple bag to do a few steps of simple water filter, blow molding processing if you need to try it!