If you don't have to buy food in the parks don't ...especially Lake Loiuse...horribly expensive... Dry ice is not commonly found in Canada...it is used mainly in industry and not available to public . Only place where it is that I'm aware of is at companies selling compressed welding gases. And it would be a bottle of CO2 that you bleed of into a box. Stick to normal ice and you will be just fine
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See post 6. Never hurts to read the posts in a thread.
Dry ice is found in most cities. Is used by bicycle and cart ice cream vendors as ice will not keep ice cream frozen. We used to buy it in dairies for use in coolers.
Also used in night clubs in smoke machines. It is not dangerous unless you touch it with bare hands, instant frost bite.
I would think that that the regulations etc. would apply to large commercial uses.