I'm going to teach you guys how to make a simple and easy mobile pump for relatively cheap.
Step 1: What you need.
1) An old all-purpose pump that has problems. You'll just need the "head" of the pump. (You can find these at bicycle repair stations or whatever local super/hyper market you have in your neighborhood.)
2) One of those cheap ball pumps. The small mobile ones. (costs about $5-10)
3) (Optional) A pair of pliers.