Greasy hair tips and tricks?

So, I'm regretting my decision to not wash my hair last night. I have to go out soon and don't have enough time to have a shower and wash it.

I also don't have any talcum powder which I know works.

Even pulled back it's still really gross looking/ Do any of you guys have any tips?

I really need to buy this stuff you can get, you spray it in your hair then brush it really quickly and it soaks up the grease. It works really well, I just don't have any.

I tried salt water once, but it was like, I mixed salt into water and while it works you end up with heaps of salt in your hair and it kind of looks like weird dandruff. It was a bit of a fail. Not to mention is makes your hair really really dry.

So, any quick tips on making it look a little less greasy? Just so I don't feel so gross.