You can make an icing bag with a Ziploc bag or even plastic wrap.
plastic wrap. - Baking Life-Hacks Everybody Needs To Know" title="You can make an icing bag with a Ziploc bag or even plastic wrap. - Baking Life-Hacks Everybody Needs To Know" class="img-fluid mx-auto d-block" decoding="async" src="https://how-do-it.com/uploads/2013/02/by_just_stirring_some_jello_into_your_frosting_it_will_change_the_color_and_fl36.jpg" width="500" height="753" />
wildolive.blogspot.com You just have to cut a small hole in a corner. See how here.