Bogleheads was solid advice. I'll bite though. The problem is that there aren't many vehicles (really any) left where you can get a decent return with no risk and maintain liquidity (since you mention this is savings money I'll assume you don't want it tied up in the market). The days of the 3-4% online savings accounts are gone so short of equity investments you are really left with CDs, P2P lending, Ibonds, etc. Here's a good article on it -
https://www.bogleheads.org/wiki/Emergency_fund
Here are a few other relevant threads that should help you decide what to do:
https://www.bogleheads.org/forum/viewtopic.php?t=161720
https://www.bogleheads.org/forum/viewtopic.php?t=157685