I wann know the name the song or who sings it with the lyrics idrink my coffee from a tin cup

The one I am familiar with is the Gene Autry version from one of his TV shows. Supposedly written as part of the story by Pat Buttram, Gene's sidekick.

Across the Texas plains is the name of the song

Maybe:
Dan seals
God must be a cowboy at heart:
"Campfire coffee, from a tin cup in my hand.
It sure warms the fingers when it's cold.
Playin an old guitar, a friend I understand,
It sure smooths the wrinkles in my soul."