If you don't have water salts, recipe will still be OK without the water additions.
The Mangrove Jacks French Saison gives a nice peppery spice character and attenuates well, Danstar Belle Saison also works fine, or use a liquid saison year (pick your own).
Suggest start fermentation at around 21C for a couple of days, then increase a couple of degrees per day up to say 28 or 30C.
Saison yeats reputedly perform better (don't stall) if you lit the pressure in the fementer - eg try covering top of fermenter with alfoil until fully attenuated, and then seal fermenter to finish conditioning. Typically might be active for a week, then condition for a 2nd week before packaging. Keg or bottle, style guide recommends up to 3.5 volumes of carb, but if bottling 2 coopers carb tabs per 750 bottle is fine.