I don't have lots of suggestions but I didn't want to read and not reply. First, love your ds's name! I wasn't making enough for my dd around 9/10 mos because of being pregnant, and she wouldn't take a bottle or sippy cup either, not for several months. I really wish I'd tried a SNS (supplemental nursing system--the tube thing you mentioned).
It's so hard to feel like you can't provide for your little one.