Reddit mentions of Dogit Cork-Screw Dog Tie Out Stake, Provides Safety and Security, Large 18" Cork Screw

If a fence is too expensive get him a long line and a corkscrew stake like this.

With this http://www.amazon.com/gp/aw/d/B001B7P83A/ref=redir_mdp_mobile?pc_redir=T1

Good on ya. I was considering those too, ended up using rebar and waratah stakes. Another option is goat/dog tether. Also, happy cake day.

Another thing that can make it easier on the both of you at times (if you don't prefer him offleash in the camp site while you guys are attending to things like dinner etc.) is maybe a 25' tie down cable you can wrap around a picnic table or get one of these things. It helps when I take my guy camping as to get some stuff done. He's never on it for more than a couple hours while we cook etc. and it makes it so we're not stumbling over him near the fire or kicking him while we're cooking etc.

I just bring his "camping" dog bed, which is just an old cheap dog bed with a few bones and chew toys and he's good to go while he's "tied down". I usually position it so at the furthest extended point he can come within reach of us but can't get near things like the fire pit and the cooking area. Since he's a GSD/Rottie he's a big guy and can easily jump up on table tops to steal stuff so you may not have the same issues with your Jack Russel but it's handy to have never the less!

There are great Tie-out stakes available for under 10 bucks. There are some with leash and stakes as well.
Here is one:

https://www.amazon.com/Dogit-Cork-Screw-Tie-Out-Stake-Large/dp/B001B7P83A