I've been an entrepreneur for years, but never in consumer product goods. I just recently started sourcing manufacturing directly from China and its been working well. Basically my process was to scour alibaba (aliexpress is too expensive) and then negotiated with them by playing them against each other. Essentially I took my product cost from 3.85 to .77 by going offshore. I would be willing to go over a step by step process to help you source the bottles.
If our call isn't worth the money I'll just refund you, no questions asked. I kinda just want to help you out because I'm interested in doing this more. I'll also give you free email support until what we talked about in the phone is accomplished.
Let me know if you want to chat about it more. Just shoot me a message.
My best -
I would not recommend www.aliexpress.com or/and www.alibaba.com. There is a lot of run around with both of those sites. I would look for a factory overseas that can help you get a high-quality bottle. How do you connect with someone? You can do a simple google search to start out and start digging from there. Or you need to work with someone who has worked with these factories in the past. I have overseas connections from working with clients in the past. Its a lot of digging annd networking, but worth it in the long run.