You can raise a wyverns without any milk. Tame a Daedon to heal the wyvern so it won’t die from hunger, and if you want full imprinting just put it in a cryopod then throw it back out if it asks for milk, that will change what they want
I got a level 150 lightning egg and I was so excited to hatch the egg...that when I went to put the egg down I accidentally ate it instead. :( ps4 users: R2 ISN'T GONNA DROP THE EGG YOU'RE GONNA EAT IT LIKE ANY OTHER EGG. REMEMBER THIS. LOGIC BEFORE EXCITMENT.