Sounds Double Dutch

Now this seems double dutch, but i got a flyer in the mail from my state mp and the local council about a joint initiative to conserve water and to outline what level 2 water restrictions mean. Now one of the things listed about what we the consumer can do ourselves to conserve water read like this, "Have you ever considered installing a rain water tank". Now this is the double dutch bit. " If I did install one, how would I fill it with rain water when theirs no rain" No rain or very little of it is why these restrictions are being enforced.