If you fill the bottles with co2 before filling it and drop in a sugar tablet (cartabs?) or two you should be fine. If you can't fill with co2 first. Just fill the bottle from the bottom without splashing and fill the neck with foam. Add a tablet or two and cap right away. Maybe the (Coopers Carbonation Drops?) should go in first? Anyway, make sure you have foam in the neck to force out the air and cap immediately, Don't do ten bottles first to be efficient. The beer is precarbonated so it should not lose all the gas and should foam nicely.
I did this once and it worked. I placed third in a competition. One note though. I had to much pressure in the bottles because I went by the directions on the sugar drops and forgot I already had some co2. If I had the proper pressure I might have taken first?