I think perhaps there's a bit of a misunderstanding as to what this provision does.
This provision does not prohibit water that has been turned into a product from being treated as any other product, from being exported--or imported, for that matter. The provision essentially clarifies that there is nothing in the act or the agreement that obliges Canada--we're talking about the Canadian implementing bill--to exploit its water for commercial use or to export water. There's nothing that says you have to do so.
Whether it is natural surface water or groundwater, it does not deal with water that has been turned into a product, like bottled water that may be, and is in fact, exported or imported.