cadi has problems starting

DEVILLE HAS TROUBLE STARTING WHEN ITS THE FIRST TIME I START IT OF THE DAY! I TURN THE KEY AND IT SOUNDS LIKE IT WANTS 2 START BUT IT DOESNT. I HEAR A POP NOISE THEN IT STARTS AFTER 4 OR MORE TRYS!
AFTER THAT IT WILL START FINE THROUGH OUT THE DAY.
ALSO I PUT WATER IN MY CAR EVERYDAY. I DON'T KNOW WHERE THE WATER GOES?? IT WILL OVER HEAT IF I FORGET TO PUT WATER. COOLENT TEMP WILL GO UP!
CAN SOME ONE HELP ME OUT...
THANK U!