Pooch is still not right - not eating not interested in anything wont even go near bones - wants to drink water

only ever drinks water out of stream or loch - now wants running tap - barking for it

Has "gurgly" tummy, self medicating with grass, no diarrhoea but then he hasnt eaten anything in last 48 hours. Lacklustre wants to sleep all the time (not sure this is lack of energy with lack of food) Just not mine poochy at all.
Any suggestions? Might take him back to vets.