Yeah exactly what you’ve just suggested is the best idea. It’s better for your nose and the coke absorbs better, so you’re not wasting any.
Just google how to do it. I mean the obvious part is that you need to mix the coke with a known quantity of water, so that you know how much coke is in each ml. Then just work out how to get a spray bottle to put it in.
I’d imagine you can probably buy another product with something like saline solution in it in a spray bottle and then replace the liquid with your coke and water.
I’m not sure if it’s actually better to mix it with a saline solution potentially? But you’d need to google that to check.
Then you just need to have an idea of how much coke is being administered per spray. I suppose you’d be best off over diluting as opposed to under diluting, cos you can always do more than one spray at a time, but you can’t only take half a spray or whatever.