In Lake County it is (lowest company price or about 100 gallons) $297 and $347. SHOP AROUND. $2.15 in Chico (Tri Flame Propane) min 100 galons. $2.86 per gallon. The price changes weekly, sometimes even daily. And most definitely by company. In Tehama County it should be around $2.24 as of June 21, 2010. In Shasta County it should be around $2.34 as of June 21, 2010.
If possible, be selective in which cat you ate feeding, or you might end up as a cat hangout. If you already have house cats, they might not appreciate the social or territorial competition. For stray cats any brand of regular cat food works. Also if you ate fish recently the scraps from that meal would be fine. Stray cats don't eat on a consistent basis, so they really would be fine with anything. Water is also necessary.
Puppies should be fed on a schedule put forth by your vet/breeder/shelter. Feeding is not dependent upon walk schedule, they are separate things. That being said, a puppy should be taken out immediately after being fed until they learn basic housetraining. Then as they learn that, the time can be extended.