The difference in development from now (8.5 months) to then (11 months) will be big too. Don't under estimate what they learn in these months.
I was exactly the same as you, no formula, EBF and dd rarely took water either. I started being more pro active with giving a sippy cup of water (not milk, as she'd point blank refused my milk unless from the 'source'
) The sippy cup was always around, free flow, with just water in. Always at meal times but also ones dotted about in living room and play room.
By 10.5 months she could drink from it herself and would do if it was around (too busy to have my milk!)
Try her with a straw too. I have many friends who had success with drinking from a straw rather than sippy cups.
By the time I went back to work, I'd leave some expressed milk with MIL (who was caring for her) but she'd refuse it. MIL just offered water regulary, and lots of food / snacks too, including water based fruit to ensure hydration. After about 2 weeks, I stopped leaving expressed milk as there was no point.
She never had milk from 11 months for 2-3 days (9-5) a week and just did a mammouth feed on my return and 3 times at night 
Still feeding now at 23 months and only at about 18 months did she start liking cows milk, even though we'd offered it from 12 months. She just loves boobie milk!
Hope this is what you want to hear. 