Find a large stone for each table leg. The stones should be as close in size and weight as possible so they pull the table equally in all four directions, helping to stabilize it. If you can't find stones, you can fill sandbags with anything that will provide enough weight.
Tie a strong rope around each stone. Tie the other end to the table legs.
Stretch the rope on all four legs so that it is as taut as possible. The table will now be held firmly between all four stones.
Purchase fishing net from a camping or home improvement store. Measure the table ahead of time and buy a net long enough to tie around all four legs of the table.
Tie the net at the top of all four legs. The net should be big enough that it gives some slack, hanging slightly in the middle.
Place heavy objects, such as sandbags or rocks, inside of the middle of the net. The table will not be anchored down in the middle.
Buy four stakes for each table leg. Make sure the stakes will be able to penetrate the surface on which you wish to steady the table. For example, if being driven into hard soil, you may want to buy metal stakes.
Cut four pieces of rope to equal lengths. Tie a rope around the top of each stake. Tie the other end to the top of each table leg.
Hammer the stakes into the ground until the rope is taut. If the rope is not taut after the stake is completely hammered down, you may need to dig it up and cut the rope shorter.