Lets assume, time travel is functional and available. Could that alone make your thoughts reality? Here is my thinking. I'm sitting on the couch watching football on a Sunday afternoon. I feel thirsty. But I do not go to the refrigerator. Instead, a moment later, a cool drink materializes on the table next to me. When I run out of chips, I do not go to the store. Instead, a moment later, a big bag of Utz materializes on the table next to me. I make a note of the day and time and what appeared on my iPhone and go about my day. Now then, ten years later, [or 20 or 30] I have bags of groceries, my coordinate list and the time machine. I send back the drinks and chips that appeared to me ten years ago. My question then is: Is causality being violated since I ate the food before I sent the food?