If you are using big glass bottles, sterilize them by stacking them in the oven, and warm them up real slow to max oven temperature and leave them there for about an hour.
This means you don't need to bugger about with Sodium Metabisulphite, it's a chore sterilising all those bottles the conventional way.
To do a larger batch, put a bit of tinfoil over the tops of the bottles, this will keep the first batch sterile for the few hours you'll need to sterilize the rest via the oven method.
I found the bottles would stay sterile with the tinfoil on top for a week or so. Convenient!
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