As long as you're remembering His body and His blood broken and spilled on the cross on Your behalf, I have no doubt He sees an issue. If you had grape I am sure you'd use that to keep the authenticity xD. The grape juice I know goes back to some of the things Jesus names Himself. As He calls Himself the True Vine in the book of John. There's a reason He chose wine but it I believe in your lack He's more concerned with your heart. God bless you in Jesus name, sister. Amen.