Just keep in mind that 150 gallons of water weighs about 1200 lbs, and it should probably be raised high enough to get a bucket under the spout. Gravity feed has certain requirements.

Price being no problem , three 60-gallon bladders might be something to think about.

Also, were you intending to store it outdoors? Does it freeze where you live? If indoors, would a faulty seam cause a major household catastrophe?

Sue