How to Prepare Sterile Water
1) Fill Glass jar with water.
2) Microwave Four Minutes.
3) CAREFULLY remove from microwave and replace the cap
4) DO NOT SCREW ON THE LID UNTIL THE JAR HAS COOLED. Tightening the lid while the jar/water is still hot can have some bad results. Once prepared, this water can be stored until needed, just don't open it.
Additional Tip
If you want your water very clean you can add an additional chemical called “PPM”. This is by no means actually needed. A link to an example is below.