C Sampling from a dug well Attach a stone of suitable size to the sampling bottle with a piece of string 2. Tie a 20 meter length of clean string on the bottle and to a stick. 3. Open the bottle as described above and lower into the well. 4. Immerse the bottle completely in water without touching the sides of the well and lower it down to the bottom of the well. 5. Pull it out when the bottle is filled. 6. Discard a little water to provide airspace. 7. Stopper and label the bottle.