Same problem at our place. We have a 25+ year old salt lick that the deer wear out in the summer. Under normal conditions, there is water in the salt pit area. This drought has dried it up so I put a large pale of water in the middle of it. The water pale scared the deer off and we did not get an image of a deer for 10 days where we used to get > 20 pictures a day. It took over 20 days to get a picture of a deer drinking water from the pale. The coons and squirrels started using the new water source immediately - but the deer did not like it around. So far we have maybe two does using it as a water source.

Deer do not like changes so plan this out well in advance.