Your tomatoes appear to have early blight.
You could make a fungicide or purchase something organic like Organocide.* Note the spelling as that is made from sesame seeds.* Organicide is not organic and contains rotenone.* Here's how to make your own fungicides
I'm not sure about your peppers as you don't say where you live or what the weather has been like.* I suspect one or two things, possibly both.* It might be transplant shock due to heat and possibly overwatering.* You mention you water sometimes twice a day.* I would think you would only need to do that if you live in the desert and have sandy soil.* Overwatering can cause wilt as well as underwatering.* You also said that you water if it "looks" dry.* You need to stick your finger into the soil up to your second knuckle.* If it's moist, no need to water.* I also recommend applying a mulch to your soil to keep soil temps even and retain moisture.* The top of the soil will look dry without mulch but could be moist underneath.
Your flowers may be dropping off due to poor pollination or heat stress from the weather.
When weeding, the best way to make sure you are removing a weed and not a valuable plant is to pull on it. If it comes out of the ground easily, it is a valuable plant.