Pope Francis provided an example of a spiritual communion prayer that can be said at communion time from home.
My Jesus, I believe that You are in the Blessed Sacrament. I love You above all things, and I long for you in my soul. Since I cannot now receive You sacramentally, come at least spiritually into my heart. As though You have already come, I embrace You and unite myself entirely to You; never permit me to be separated from You. Amen.