Hi, everyone. First time here. Picked up a plant with bright purple/pink/almost red leaves at a plant store last week. The man at the shop said it was an indoor plant, and only needed about a cup of water a week. I've had to water it every day to keep it from wilting, but it's just not doing well. I thought I could take better care of it if I knew what kind of plant it was. I google imaged searched to no avail. I've attached an image of one of the leaves for reference.
Thank you in advance!

What you have there looks to me like a coleus. I have never grown then inside. Maybe someone who has will chime in? Have you repotted it? I'd dso, it could simply be transplant shock. What area of the country are you in? Most coleus live in shade but there are a few who can take sun. Again, i only know this as an outdoor plant. I keep mine evenly moist.

I think its an Amaranth called "Bloodleaf". Maybe Iresine herbstii.

The one leaf with clear darker veining in it does look like iresine, and just like the pic in the Sunset Western Garden Book. Depending on where you are I guess it could be a house plant, but at this time of year, unless you live in Iceland, well, even there they have summer. I'd get it repotted into a bigger pot, and get it into the sun for at least three hours a day for a while and gradually move up, but not too slowly, to full sun - 6 hrs or more/day. Iresine needs regular water, which I think is about 1"/wk. Someone will correct me if I'm wrong, please.

Bloodleaf (Iresine herbstii) in plant database.

I have that growing in partial shade. It will grow in more sun, but it bleaches out. Very easy to start from cuttings either in water or soil. It does need plenty of room and water.

Oh, good. I'm wrong. Partial shade is way better because I've got some of that in a really good spot for it. Good to know.

It really helps brighten a shady spot, where few colorful things grow. The only pest I've ever seen on it is Grasshoppers, but boy, do they love it!

Grasshoppers, you say? Ok, I'll get a gun.

Well, mostly, just those little green ones, so I don't think a gun is required...yet.

I'm pretty sure a Gatling gun is required. That will take care of the grasshoppers and squirrels.

Not to mention raccoons, bears, and neighbors . . .

I agree, it looks like Bloodleaf (Iresine diffusa f. herbstii) A lovely plant!

A gatling gun. I never thought of that. So how do we get rid of grasshoppers really?

In a dream I had a couple of years ago, my DH and I used a gunship. "There's one! And another!"

Had to laugh Celia...We have the very large, very hungry Eastern Lubber Grasshopper here. After a conversation with my grandson one night about alien invasion movies and them looking like insects, I dreamed I was chasing lubbers in a space ship and zapping them with my laser death ray...chortling the whole time...die you alien buggers... until I woke my DH. (but secretly quite pleased with my kill rate)

Ha! Jean, that's hilarious!