Need some guidance on what to pick as my bond/fixed income/market downturn hedge.

So, currently mulling over how to diversify and looking to hold 20/25% bond/fixed income to hedge things when my stocks tank. Considering the following. # 1 - probably the favourite - Fidelity Cash W Inc, BD1RHR6. Short term money market fund. Does about 5% yearly. # 2 - maybe some kind of fixed income stock Like say, Fidelitys FUQA, or SCHUD. Consists of lots of top 100 companies so feels like a fixed income version of the snp100. # 3 - DBMF managed futures. Typically moves in opposite directio