Second the recommendation for Raybo's mix, it works superbly in SWCs/SIPs.
Miracle Gro also works, but ran really wet for me (and clogged and got stinky).
I use a big plastic tote (in a wagon) to mix up reasonable-sized batches. I use a 32 oz cup to scoop and then stir with gloved hands. Oh, and stir until you think you're done, then stir some more.
If you heat the water a little before adding it to the peat, it will absorb more readily.
What are you planning on planting? Peppers?
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