Fizzy Partydrink

Stumbled on this recepie ones when I left a bottle of lemonade standing for a few days. It was raspberry and organic without preservatives or artificial sweeteners. It turned out as a fizzy, slithgly alcoholic and delightful drink.
Note that the end product will contain a slight amount of alcohol.

5 teaspoons of Sugar - only if the juice is unsweetened
1 packet of dry Yeast
2,5 teaspoons of Dishwasher detergent. The cheap stuff, avoid ultrashine and whatnot.
5 Plastic Soda bottles at 1,5liters
Measuring cups for teaspoons, liters and halfliters.
Ecological Juiceconcentrate, Enough to make 5 liters. Absolutely no artificial sweeteners or preservatives
Water

Clean out the bottles by pouring half a teaspoon of dishwasher detergent into every bottle, filling them with hot water, put the cap on and shake. Put the bottles aside for now.

Put the sugar (5 teaspoons) into a one liter beaker, add the packet of dry yeast and fill up with lukewarm water to get one liter of culture going. Stir it a bit.

Empty the bottles and rinse them twice or thrice. Make sure you get ALL that nasty chemicals out.

In a measuring cup measure up the amount of juice for every bottle and pour it in the bottle.
I had half a liter of strawberry and another half of black currant to be mixed 1+5. So I put one deiliter of each in every bottle.

Do the same with the yeast culture. Measure out the amount you need and pour it in the bottles.

Now then .. There's enough juice in every bottle for one liter of drink. With the yeast there's 4 dl in every bottle and to get a liter we add 6 dl of lukewarm water.

Next you shake the bottle. Not much even turning it upside down once or twice is good enough.

Just let it sit with the cap firmly on for about a week. Check up on it every now and then mostly to make sure it doesn't explode. If the bottle seems to bulge a lot release the cap gently (if you unscrew it to quick it could fizz all over the floor)
When it seems clear just put it in the fridge over night or until its as clear as it should be.
Serve chilled and taste before you give it to your friends.
I just set this batch for a party next saturday so I'll be back with pictures of the finished product later.

Okay .. so these have been brewing for a few days now and they nearly exploded.
The solution is to:
1.After shaking twist the cap off and just screw it back on gently, not hard. It needs to let off some gas.