It depends on the seeds and what strain of poppies are used... I hear these days it's mostly a high-thebaine strain. I tried codeine, kratom, hydrocodone, oxycodone, heroin, morphine, methadone, poppy pod tea and poppy seed tea, and was addicted to many of them (including heroin and oxy) at various times, and I eventually settled on poppy seed tea. Some seeds suck, but I found a place to get super cheap bulk unwashed seeds just absolutely sticky with opium. It was my favorite opiate, I loved it, it lasted an entire day and kept withdrawals at bay for like a day and a half, was really euphoric, sedating/noddy, and calming. I felt much more stable on them, like methadone but better. I never IVd, you must understand, so I'm sure if you've crossed the IV line, nothing is going to compare that isn't IV. I was addicted to many opiates for 10 years, and seeds became my favorite. But a lot of seeds were crap, it's true.
As for the bottle size, get a big bottle, I would use 64 ounce Gatorade bottles, they're huge, I could fit 2 pounds (almost 1000 grams) into the bottle at a time.