wilted and brown leaves

I just started growing some plants outside in my backyard. The plants are about 3 weeks old and are in 5 gallon buckets. The temp out here is in the mid 90's and it's the 3rd day that they have been out there and some of the leaves have started to turn brown, curl, and wither. Any advice on what my problem could be and how often I should water, also should I be spraying the plants with anything and if so what.

are there large drainage holes in the bucket? are they the lowest leaves that are turning? can you post a photo?

Yes they are the lowest leaves. There are 3 drainage holes that are 1/2 inch round in the bottom of each bucket.

how many nodes does the stem have? also, how does the new growth look? is it dark green, light green? and did you feed it any nutes yet?

I haven't given it any nutrients yet. Are nodes where the leaves branch off? if so there is about 6 on each plant. The leaves are dark green. And does it matter that they were indoor plants for the first 3 weeks and then they were moved outdoors?

Sounds like an over watering problem, been there. The soil needs to air out...then begin strict watering schedule. Cal-Mag 1-0-0 or fish extract 2-4-0 is also a good additive you can add with your water.