Please choose the correct ending to complete the given sentence: Health: [header] How to use uv to sanitize water [title] Purchase a portable uv water purifier. [step] Portable uv water purifiers can be found online or at your local outdoor store. There are a few different models to choose from depending on what you are looking for.

Ending1: [substeps] Unlike a portable water purifier (or you can buy one right from the store), portable water purifiers typically come with dipjacks. These rebooters screw into the water bottles below. Ending2: [substeps] A portable one is a 2 liter liter glass container with an air filter. A portable a is a 4 liter of water container with an air filter. Ending3: Things to consider are the amount of water you need to sterilize and the weight of the device. [substeps] You may be able to find a small uv pen that sterilizes water, such as the steripen. Ending4: [substeps] Gas-powered or purified water purifiers can often be found through college or university libraries. You may be able to find one online if you are looking for a specific model of uv at a local gas station.

Answer format: ending1/ending2/ending3/ending4