If I can get some firehose what is the best size to get 1.5" or 2"?

2"

why is 2" better than 1.5"?

1.5 ? Out here we use 1 inch; 2 inch and bigger. I know that the dang 1 inch LOVES to kink - even when under preasure. I use hoses for fires though ; not bowmaking...

As the hose expands, you want it to still stay wide enough to cover your limb. Two inch is better if you can get it.
 Let me know if you don't have any luck. I may have some stashed away some where. jwingman

Well no luck, seems everyone is using it around their boat docks here.