Why didn't Iron Man bring "more suits" to help his team mates?

But why can't Tony bring in his army of drones/suits to help his team win in Captain America: Civil War?

During the Civil War movie, Tony is very emotionally unstable and critical of his own faults and mistakes in the past. He is cautious to a fault with his own strengths during the majority of this film.

If you were paying attention, Tony Stark mentions how he destroyed all of his other suits after the Ultron problem. His own suits being used against him and others due to a rogue AI has made him extra cautious. It would seem he only keeps one suit now, and only uses it himself when necessary.

War Machine had this suit before Civil War, and before Age of Ultron, so it makes sense for him to still have it, it's his now, not Tony's.

As for Spidey, there's nothing amazing about the costume he has made. As far as we can tell it's not a technologically advanced suit, it's just a nice costume for him to wear. Undoubtedly made of premium materials, but nothing special going on otherwise.

I think in the end we're seeing a Tony that has realized, similar to Ant Man, that his technology in the wrong hands could make the world a very dangerous place, so he's starting to mature a bit and playing it safe.

Tony is trying to cut back. At the end of Iron Man 3, he tries to retire, Because thats what Pepper Wants. But as he says to Steve in Civil War, the need to clean up the Shield/Hydra mess left after Winter Soldier, followed up by the Ultron issue in Age of Ultron, he creates more. He only creates a handful of Iron Legion (Five I think). And it backfires. And he tries to retire again, leaving the avengers in Capt's hands. But the issue in the Lagos, Nigeria bombing draws him back in.

He wants the Accords because it would allow him the middle ground between being Iron Man, which he is incapable of giving up, and giving Pepper what she wants, Him safe.

For him to create more would be to give up Pepper. Tony does not want to give up Pepper. This, and regretting what happens when his tech is abused, are the primary motivating factors for Tony in the film.

He also doesn't have the time to create more. Start to finish, Civil War happens in days. Stark is given 36 hours to bring Team Cap in. He is able to fabricate a new suit for Under-roos as it is light on technology (Spider-Man is superhuman and doesn't need much), but new suits take time to build. Like, 3 days at least (The timeline before the Avengers movie was called Nick Fury's big week. Tony does some miracle work in a few days).

Tony states he cannot trust others with his Iron-Man suits, which was his intention in one of the previous Iron-Man films (I can't remember which one).

All the prototype suits were destroyed prior to the beginning of events in Civil War.

Tony had just finished encouraging everyone to sign the Sokovia Accords, which, in essence, give the UN the power to dictate what the Avengers do. The various world governments have been exceedingly nervous about all of the Avengers, including a congressional hearing about Tony's (at the time, only) suit. I therefore disagree that "it would be easy" for Tony to create a thousand more suits. I find it more likely that the UN would forbid Tony from creating any more of these weapons of mass destruction than he already has.