I was assuming the second case. To clarify if $1000 buys you 1000 pounds of bread now, then in 6 months you will have $1060 worth of Bitcoin but the price of those 1000 pounds of bread will have gone up to $1060 too so you get the same amount of bread as before. Bread hasn't gotten cheaper for you as you were hoping.
This is of course for the ideal case of a stable currency. Bitcoin is fiction like Harry Potter or Santa Claus. It's not involved in any real world economic transactions involving bread or anything else you were thinking of using that credit card for. Dreams on the other hand can evaporate just like 7 year olds eventually realize Santa isn't real.
If you want to speculate on the dreams of nincompoops that are naive and miserable but have money to spare then go ahead.