When DD was 12 months her schedule was:
waking: any time between 6-7 - 3oz formula
breakfast an hour later or at 8 at the nursery
weetabix or Plum porrigde with cows milk and toast
nap: at home from 9-10.30isch, at nursery random
lunch at 12-13, at home mostly a sandwich or something small, at nursery the full menue
nap: at home appr. 2hr, at nursery random times
snack at 4isch: yogurt, cheesestraw, muffin, scone, cereal bar
dinner at 6.30pm: either sandwich (on nursery days) or normal cooked dinner with us
Milk at bedtime at 7.30-8pm (3oz)
She drinks water at mealtimes and I offer her a beaker in-between, esp. after naps. amounts still vary between a couple of sips and 10-12oz a day. With 13 months I swapped to cows milk as I didn't think it made sense preparing the small amounts of formula esp. as she never accepted a bottle and was drinking from a cup.
As she didn't nap well at the nursery I kept the 2 naps per day until she decided she just needed one. That was with 17 months.
They have a growth spur at 1 year and can get grizzly. It wasn't too bad for us, honestly the 18-months one was worse (sorry, you don't want to hear that) but after 2 weeks world was back to normal. They learn so much in this small amount of time, no wonder they aren't always happy. Going out worked wonders for us.
Keep going, they are a lot of fun later.