How often should i water my tomatoe seeds?

I live in oklahoma and we're not getting very much rain l8ly. i watered my watermelon seeds every day and they popped up really fast. My iceberg lettuce plants said 10-14 days for germination, it only took three days for most of them to pop up. ive had my tomato seeds and my pumpkin seeds planted for four days now and i know they will take a little longer to germinate, however i would like to know how long it will take for them to start showing (both the tomatos and pumpkin seeds) any help will be appreciated. (i may have drowned all of my seeds by now. ive watered them every day for the last 4 days and im not sure if thats good.)