A shampoo bottle always works great for me. Especially if it had the "nozzle" type cap. I also have a bottle of facial cleanser that fits me perfect. It's even shaped like a dick. It's about 3" in diameter & about 6" long & the lid is like a dome,very much resembling a real life cock. I can pretty much fit the whole thing in me.
I would still love to have my very own life like vibrating dildo though. Or even the real thing would do me just fine.