Combining snapshot firestore flutter

gistfile1.txt

import 'package:async/async.dart';

final Stream<QuerySnapshot> stream0 = collectionReference
          .snapshots();

final Stream<QuerySnapshot> stream1 = collectionReference
    .snapshots();

return StreamZip([stream0, stream1]).asBroadcastStream();

body: FutureBuilder<Stream<List<QuerySnapshot<Object>>>>(
        future: _repository.getSnapshot(),
        builder: (BuildContext context,
            AsyncSnapshot<Stream<List<QuerySnapshot<Object>>>> snapshot) {
           switch (snapshot.connectionState) {
            case ConnectionState.done:
               return StreamBuilder<List<QuerySnapshot>>(
                  stream: snapshot.data,
                  builder: (BuildContext context,
                      AsyncSnapshot<List<QuerySnapshot>> snapshot) {
                        final List<QuerySnapshot> querySnapshotData =
                        snapshot.data.toList();
                        
                        for (final data in querySnapshotData) {
                          // you can access your snapshot here...
                        }