Is it possible to prime bottles a second time?

Brewmunn

As a newcomer to home brewing I've made a blunder! I've bottle my brew and subsequently realised that the screw caps were not on tight enough [Pet bottles] and the gas has escaped. My question is can I pop a bit more sugar in each bottle to enable carbonation for a second time or is the brew literally down the drain?
Any and all view would be appreciated.

BUDFORCE

Firstly, your brew isn't down the drain I'm sure it'll be OK flat or you could add a pinch of lemonade to fizz. I think it could work to add more sugar and pressurise but it might take a long time to carbonate depending on how much yeast is left alive but probably not much even a microscopic amount will feed and multiply but it'll take longer the less there is.

If you don't fancy the idea of drinking it flat it's worth a go, make sure you keep them at room temperature.

Brewmunn

Thanks Budforce.
There's no way I could drink it flat; I don't mind drinking beer without a head so long as it has some body. I will try the extra sugar but may be a compromise is to mix it with another beer. Whilst it won't be what I wanted originally at least it will get consumed.