These steps may be important;

1) Check the appearance of water

2) stirring of water may be helpful

3) Feeding can stimulate water intake as mostly use water after feed (esp., concentrate)

4) some at spot exercise (walking) could also increase intake

Thank you but the factors you mentioned were already assumed to be present !

1) water appearance clean and devoid of unpleasant smell or other negative qualities

2) herdsman watering camels was stirring and splashing water

3) camel were fed and of the fodder was moderately dry

4) camels were exercised (the walk several km to reach the water point)

I know one traditional method used in Somalia! I am just curious to see if somebody else can come up with the same or a different method.