You can use it as-is, just add chlorine drops to the dirty water in the bottle.
4-5 drops per quart.
If you want a gravity setup you can use a 1L water bottle cut in half as a scooper and a funnel. IE cut it in half and use it to store everything.
Some people use a 2L platy with the top cut off as the top part of a gravity bag system. You want to prefilter with something like a coffee filter etc.
Vinyl is probably the lightest tubing.
You can get it from Ace hardware or Home Depot.
I scavenged part of an Aqaumira frontier pro for one of my setups.
Only other thing you might want is a few platys or some grocery store water bottles as containers, a dropper bottle and some chlorine if you want to kill viruses and bacteria.
Here is a link to one of my setups.
Different sawyer filter but basically the same idea. You would just use push on hoses.