Poppy seed tea will work if you can get decent unwashed seeds from a bulk food store. That is what I would recommend, buy a kilo and fill a 1.5 L bottle just above halfway then add enough cold water to cover and so it shakes easily, shake for 2 mins max then unscrew cap just enough so you can squeeze the water out while leaving the seeds in.
It kicks in within 15 mins so if you don't have a high tolerance only start with a small amount and see how you feel 30 mins later
It can be very strong. The seeds I get from the local bulk food store can keep my out of withdrawal at 1 kg and I take 90mg methadone daily. And morphine has awful oral bioavailability so the fact it can keep me well when taken orally means it must have a LOT of morphine in it.
Unfortunately though different sources may not be nearly as strong as that but if you feel awful it's def worth a shot.
Or if you can access poppy pods they are good as well