Where are you? Sometimes the heat is so intense in midday or the afternoon that the leaves wilt, and then they can't recover even if you water them later in the evening. I've found some peppers like some afternoon shade. You could try propping some row cover over them (so that it's not touching the leaves) or putting some other barrier to afternoon sun, then see if the leaves are still drying in the evening. Or water in the morning, if you can.
Are they in containers or in the ground? If they're in the ground, daily watering shouldn't be needed, and in fact may be stressing the plants. Do you check the soil before adding water? Peppers like hot roots, but in midsummer, the pots may be getting too hot. I double-pot (leaving a 1-inch airspace between pots, or filling that space with mulch) to protect the roots.
My peppers are mulched, and I water once every 5-10 days or so.
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