what size holes do the bottles have? if you use a newborn teat (i think they are the smallest holes) bub will still have to work to get milk from the bottle like he has to from the breast. the ABA has a couple of brochures from grandparents and carers on the breastfed bub. they have some tips on feeding ebm. i like the sippy cup idea too.

Australian Breastfeeding Association - A Caregivers Guide to the Breastfed Baby

Australian Breastfeeding Association - Cup-feeding

When you are home, i would only offer the breast. There are some tips here on relaxing bub and mum that can help.

Australian Breastfeeding Association - Breast Refusal