Add the warm water slowly, mixing all the while so it won't be too lumpy.
Store in a jar.
When ready to use, put cotton into the top of a jar lid to fill it, and then saturate the cotton to the top.
Place where you want it; make several if you need it.
Will keep for a long while.
NOTE: I usually drip a drop or two over the edge of the lid to rest on the counter so they will find it sooner.
It sometimes takes a little while for them to find it, but find it they will.
When they do, let them alone; you will want to kill them because they look so creepy; but don't because they will hang over the edge of the lid and drink, drink, drink, and then take it back to the nest.