We use Nestlé water, they offer a great service and always come the same day if I request extra bottles before my thurs delivery day. As far as I'm aware(from my dentist) they have the best fluoride and sodium levels, stand corrected if I was advised wrong of course
HTH
have always used oasis water in the many years living here, its not the cheapest but they are very professional. also if i do forget to put my bottle out, i could of course ring them up and they will come around even not on their scheduled day, but their offices are right by mataq bridge and very easy for me to just pop in for another bottle, not so with the other companies around town.