Bottle Bombs..........
It can be surprising how quickly these can develop.......
About 2 1/2 months ago, I was making a quick batch of "ginger beer". A recipe off the net that I'd used before.
I had enough ginger to make 10 litres, so the recipe was scaled up and mixed.
Now the instructions said about putting the mix into PET type pop/soda bottles, then leaving somewhere warm until the side of the bottle can't be depressed with the finger. At that point it goes into the fridge.
Unfortunately, because I'd made 10 litres, and so I didn't get nagged by "erindoors" about leaving bottles everywhere, I put them on top of the kitchen cabinets (sunday evening), and forgot about them. On the following wednesday morning I notice them and that the 2 x 2litre bottles were starting to deform in shape.
I took them down and put them on the floor in the outhouse while I was making room in the fridge, as I reached one of the 2 litre bottles, one of the 3 litre bottles fell over. It exploded, showering everything (including the 2 cats who were tucking into their breakfast biscuits) with ginger beer.
Luckily, and mainly because the bottles were plastic, I only suffered superficial cuts to the hand and shin, but it was a salutory lesson, only to make enough ginger beer to fit in the fridge in 1 go and to make sure that any efforts to make sparkling wines/meads will be in champagne bottles with plastic stoppers held on by wire cages and not there won't be any "warming" time, they'll go straight to the cool storage under the stairs to carbonate slowly - using the "priming" method.
Oh, and I agree with wayne about the artificial sweeteners, most of them taste "baarrrrffffff"! So I'd suggest either Lactose or sulphite/sorbate followed by back sweetener of honey or sugar.