Storing - Preserving poppy tea in liquid form

[kant]

SWIM knows that it is not advisable to store poppy tea as it spoils really quickly, however, he does not have access to a proper oven and thus cannot make CFO either. And even if he could, he's not sure he'd bother going through all that mess.

So, if SWIM, say, filtered his tea (two or three doses) carefully using many coffee filters and simmered it down to somewhere about 300 ml or so, how should he best preserve it? With alcohol? Or does 300 ml require too much alcohol thus forcing SWIM to take a lot of it when using the tea?

Are there any other methods?