I built mine using a small bulb pump but might upgrade to the whale babyfoot. Here are the materials:
1/4" loc line (1) $8
small spring clamp (1) $5
1/4" primer bulb (1) $12
Brass Hose Barb with Straight Fitting Style, 1/4" Thread Size (2) $2
Total Cost: $27 (excludes zip ties and buckets)
I like having the modular faucet head. You can drop it down into the bucket to splash less and then raise it up as the dirty gets full.
Will post pictures later. Connect the loc line to the clamp with a zip tie. Loc line connects to the barb then barb to the primer bulb hose. The second brass hose barb is used as a weight to keep the intake at the bottom of your supply jug. I use 2 5 gal buckets stacked. Bottom one has a hole drilled in the side. I made a wood platform that the bulb sits on using more zip-ties.
The flow definitely leaves something to be desired but it was cheap and it works.
Here are some links (all on amazon or grainger):
You could use these parts for more flow
Hose Barb (2) $10
1/2" tubing $13
baby foot pump $23
1/2" loc line $9
total cost $60 (excludes zip ties and buckets)