"Securing water is the most important part of survival. That's why you've gota have a good strainer with you.
The Strainer is a special item that can be found in Resident Evil Outbreak.
It is located at the B1F Waste Liquid Disposal Room between the shutter and the barrel by the Green Herb. It's located in The Hive on hard or very hard difficulty.
- Birlew, Dan (2004). Resident Evil Outbreak Official Strategy Guide. Indianapolis: BradyGames.