We always go to dim sum restaurants as we can stay there long enough to feed our girl. She is also a slow eater. At a dim sum place, we can find a lot of support, e.g. hot water for heating up the milk, high chair for her to sit on, big table for her to draw on, sufficiently spacious for putting the pram, our bags ...
We've tried out benches, parks, feeding rooms in malls ... so far restaurants (not fast food style) are the best.
My son is almost 5 months, lately I started using “rice water” once or twice a day to mix formula. He drinks better and more. I heard that rice water would clean up the digestive system so maybe that is why.