home.dart

import '../repository/beer_repository.dart';
import '../models/beer.dart';

...

class _HomeState extends State<Home> {
  List<Beer> _beers = <Beer>[];

  @override
  void initState() {
    super.initState();
    listenForBeers();
  }

  void listenForBeers() async {
    final Stream<Beer> stream = await getBeers();
    stream.listen((Beer beer) =>
      setState(() =>  _beers.add(beer))
    );
  }
  ....
}