Or do these foods have to be made Saatvic through mantras/rites before they can be eaten?
According to Mahābhārata, Kṣatriyas can hunt all wild animals and consume their meat directly:
Desirous of benefiting all men, the high-souled Agastya, by the aid of his penances, dedicated, once for all, all wild animals of the deer species to the deities. Hence, there is no longer any necessity of sanctifying those animals for offering them to the deities and the Pitris.
The Critical Edition (Bibek Debroy's translation), provides additional context:
Listen to the ordinances that have been laid down for kshatriyas. If they eat meat that has been obtained through their own valour, they do not incur any sin. All deer and wild animals are said to have been dedicated to all the gods. O king! This was done by Agastya in ancient times and that is the reason hunting is praised. There can be no hunting without being prepared to give up one’s own life. O king! There is thus no difference in form between the one who is killing and the one who is being killed. O descendant of the Bharata lineage! That is the reason all the rajarshis went on hunts. The learned say that this does not lead to their being tainted by any sin.