You're probably better off using the BitCoin blockchain (which is a distributed network). It's well documented that you can include data in BitCoin transactions and pretty secure.
But I'd bet you could store information in the DHT itself. Here's the issue: to store the information in the DHT you'd have to attach it to a torrent. To make it relatively persistent the torrent would have to be popular so that it will continue to be seeded and not disappear for a while (like a movie file or a popular music album). If you're doing that you might as well stick the info in the torrent itself instead of hacking it into the DHT. That's what torrents are for.
But I'd bet you could store information in the DHT itself. Here's the issue: to store the information in the DHT you'd have to attach it to a torrent. To make it relatively persistent the torrent would have to be popular so that it will continue to be seeded and not disappear for a while (like a movie file or a popular music album). If you're doing that you might as well stick the info in the torrent itself instead of hacking it into the DHT. That's what torrents are for.