So cut the base off the plastic bottle first put the bottle upside down in to a coffee cup.
Make a water filter out of a pop bottle.
Sapwood such as pine contains xylem which can absorb and filter out dirt and bacteria.
The pop up nipple on the bicyclest bottle just happens to fit over the nipple tube that fits on the end of the filter that otherwise drains into your filtered water receiveing vessel.
Make a plant xylem filter using a water bottle and a pine branch.
From top of bottle to bottom.
Then go backwards with the finest filter nearest to the open top.
This will mean the clean water comes out of the bottle into the coffee cup.
Simple water filter out of a waterbottle.
A water filter can be a necessary survival item if you have no access to clean water.
Starting with the bicycle bottle full of filtered water place the bottle nipple over the filter nipple.
It can remove up to 99 9 of bacteria from water but will not remove viruses such as hepatitis and rotavirus.
This water filter is very easy and quick to make.
Filter material hay grass leaves of safe trees oak maple the goal is the farther down you get the finer material you take out of your water.
Most if not all the materials can be found in or around your house.