Bring bottled clam juice and potatoes to boil in heavy large saucepan over high heat.
Reduce heat to medium-low; cover and simmer until potatoes are tender, about 10 minutes.
Remove from heat and set aside.
Melt butter in heavy large pot over medium heat.
Add bacon and cook until bacon begins to brown, about 8 minutes.
Add onions, celery, garlic and bay leaf and sauté until vegetables soften, about 6 minutes.
Stir in flour and cook 2 minutes, ensuring flour doesn't brown.
Gradually whisk in reserved juices from clams.
Add potato mixture, clams, half-and-half and hot pepper sauce.
Simmer chowder 5 minutes to blend flavors, stirring frequently.
Season to taste with salt and pepper before serving.