loss in udp

I need to send some data over UDP (cant use TCP), and i want to make sure that the data gets there. I thought that sending som data to the other host, and then that host sends a reply back saying HEY I GOT IT, but then theres a chance that HEY I GOT IT is dropped too..

is there any way i can make sure that the receiver gets it??

Not the OP, but I have a similar problem related to UDP. It's more of a simple question. I'm using UDP as a crude means of inter-process communication between processes (local UDP socket.) I won't suffer the unreliability problems over localhost, will I?