How do I convert liquid 250cc's to ounces

Do you mean cc like centimetre cube?

This has been answered many times on Ask Me: use the "Ask your question or search" box.
Remember, cc are the same as mL (cc/mL/liter) and you want to convert to fluid ounces (ounce/quart/gallon) not avoirdupois ounces (ounce/pound/ton).