Any tips for winterizing a house without central heat?

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I have a question. I have some vacant properties in the South but it's still cold enough for a pipe to burst. 

One of the units is a duplex and shares a wall with an occupied units. 

Should the winterizing be different from the duplex which shares some pipes with an occupied unit versus the SFH vacant?

The houses are built above the ground. I have the water turned on, but don't have window units are spaced heaters. 

I think I may have gotten lucky. I just had a pipe burst but the damage was isolated to beneath the house. The cause was a rotted pipe according to the plumber. The interior wasn't affected. 

What can I do to prevent further damage? I have a property management company but I'd like to sanity check their ideas. 

Thanks in advance