We find this natural element in the sound of the waterfall, the lulling drumming of a creek or river as it flows by, and even in a basic water fountain--be it decoratively set on the end of a small table, or taking up the entire corner of a room.
The relaxing lull of a water fountain can be used for meditation with its gentle flowing or trickling sound, which can help to focus the mind in order to keep it from wandering to stressful memories or worries.
If you have the opportunity during your day to find a water source, you can sit and soak in the relaxing sound no matter where it is. Many cities have water fountains just outside some major buildings, and some businesses have built-in court yards with fountains or ponds for people to sit by and enjoy. In most states you can also enjoy natural water sources like creeks and rivers, as well as waterfalls and lakes, as you venture out onto trails and open spaces.
If none of these are available to you, there are an abundant number of natural water sound CD's and even videos that can be found to order and enjoy on your audio player or TV screen. With your eyes closed you can use the power of your imagination to match the scenery in your mind's eye with the sound of the water on these recorded resources.