bulief - I know your pain! I've just been through this with DD. We had tried all sorts of cups, bottles etc since April with no joy. DH, MIL, SIL, my mum, my sis & a friend had ALL tried, as well as me. The bad news from our perspective is that we just got nowhere. And finally she started family daycare (8 hour days twice a week) 2 weeks ago. For the first FOUR days she drank nothing, not one drop. Then on Monday (5th day) she was given a Nuby straw cup (... and she downed 50ml of chilled EBM happy as larry (and yes we'd tried it warm, cold, defrosted, fresh... you name it). Incidentally we felt the Nuby (with valve) or the MagMag seemed to be the most likely options to work. If I were you I'd try to get her to do full days without you prior to that 48 hour stint. Also, my DD eats really well, so she still ate & slept ok(ish) without me, and my carer tried to give her liquid foods too (we were both relieved it wasn't summer!).

Now that i know it took her four full days, I can see why it didn't happen with me & my boobies around!

And my only other suggestion, lots of happy faces & cheering, try outside if that calms him down. GL, I hear your pain it's really stressful isn't it.