If I remember correctly, Blood Watch's hippogryph master is Laando.  If you've spoken to him before, then you can take one of my hippogryphs to him.$B$BThat's a good lesson to know: hippogryphs are always trained to fly to their capital city, but they'll only take you to a remote hippogryph master after you've already been there.$B$BSince you arrived on one of Laando's hippogryphs, you can also use that route to return to Blood Watch with the caregiver's supplies.