Need directions-Cattle Water Tank made frome used tire

I am looking for some instructions or directions on "How To Make A Cattle Water Tank Out of a Large Construction Eqipment Tire"?  I have seen some 6-8' used tires made into cattle water tanks in cattle magazines.  I have access to some used tires however, I am not quite sure how to make them.  Can some of you who have made them before, or can tell me where to get "How To", directions, please help me out.

Thanks in advance,

Cutting the tire is the worst part.

ai er said:

Cutting the tire is the worst part.

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Just get a pair of pneumatic scissors, they will make short work of any tire