How to inject F/T feeders with water?

[Craiga 01453]

I've read about injecting thawed mice with a little water to help with a snake's hydration. This might be a dumb question, but how exactly do you do that? Just with a regular syringe/needle into the skin? I tried Googling with no luck. I don't want to feed them wet, as we're still establishing ours on F/T and use a hairdryer.

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Seems like a long, unnecessary walk around the block when you can just defrost in water and serve wet.

And what makes you think it's needed in the first place?
A thirsty snake with a clean water bowl will drink...