Ok, so it's kinda tricky~
There are certain kinds of contact liquid that works for your eyes. The first time I was prescribed with some, it made my eyes red and kind of stung, but it went away after a few minutes because of constant blinking makes so the only liquid in your eyes is your own. I'd say most of the liquid is really safe, just sometimes uncomfortable.
The other is a container for contacts, like
Depending on your purchase, you might get these along with your order. Also, you MUST have one of these, no matter what, and make sure it's full of contact solution (liquid) and screwed on shut afterwards. I've had my contacts dry up on me, OH NO. xD AND THEY GET ALL CRUSTY AND UNWEARABLE.
AND THAT'S IT.