Okay, to quell all the objections to cheap tools, Harbor Freight, etc.
At minimum you'll need a full Snap-On set with 6 and 12 point sockets, shallow and deep in 1/4" & 3/8" drive, metric and fractional inch, no skips. Several ratchets and at least three different extension lengths for each drive size. Could probably roll it into the vacation home's mortgage.
Seriously though, if willing to invest a little time a good quality used set can be had cheap. I've been culling and struggled to get $10 for a 10 pc set of 3/8" US Craftsman sockets. Otherwise the HF stuff will serve you just fine to assemble KD furniture, kids toys, BBQ grills etc.
Frankly, I no longer keep any sockets in the house as they are seldom useful. Most repairs require driving screws or turning open end wrenches on pipes. I surprised myself at how few tools are actually needed at hand for most repairs.