Mine don't drink much either and this has always been very commonn with Basenjis as you know. To encourage mine (who're fed raw) I give them a watery drink after every meal -I do things like mix in a little vegetable water, the rinsings of tins which had contained food of any kind, the rinsings of yoghourt pots and all sorts of tastes and I find that they will drink all of what I give them . In fact when two of mine were staying with friends they were puzzled by the way they just stood waiting after they'd had their meal. They wanted their 'milk shakes' as my friend calls it!
I 'm glad to hear that Buddy is doing well and hope he continues to do so.