On Friday, November 6, 2020 at 10:27:22 AM UTC-5, wrote:

For a one-off drawer, you can cut the dados with a backsaw and a chisel.

Or dado-less is possible if support strips are glued & screwed
along the inside bottom of the sides and front & back ?
to support the drawer bottom. Not as strong as a dado but
quite adequate for average household stuff.
John T.

And the drawer bottom doesn't need to be as accurately cut.

Undersize the drawer bottom to account for the inaccurate cuts that
the home center will make, add the strips and drop the bottom in.

Heck, the drawer wouldn't even have to be square. Adjusting the size
of a drop in bottom could be done with a saw, a file, sandpaper, whatever.

In addition, depending on the size of the drawer, 1/4 bottoms might be
enough. Even easier to adjust.