HelpThisAbandonedKitty

I found this kitty and was told it he was abandoned by the owner.  I took him home and started feeding him.  Over the last couple days I've noticed he's not drinking he was only eating wet food. Yesterday I noticed he wasn't even interested in food or fluids so I dropped him off at an animal hospital. I was told it's $328 just to do the diagnostics at Cape Fear animal hospital and that's not including IV fluids or any type of medication people who know me know I love animals I have three cats and one rabbit I promise you I wish I could handle one more cat but right now it's about saving his life and what scares me as I just can't afford this bill.