Do childcares provide food for kids at 18mths? What if the kid is allergic or refuses to eat certain food? Can we bring our own food? Also, at 18mths, do the teachers feed the kids or do the kids have to feed themselves?

Yes they do provide food. You can also bring your own food but it also had to depend on which centre you are going to. Perhaps check with with them during enrolment . 18 months is still quite young, so most probably the teachers will help to feed . But they will also teach kid to learn how to eat and also encourage them to eat by themself . If not the teacher might not have enough time to feed all .