Simply so, how do I make the soil more acidic in my tomato plants?
Incorporating lime into the soil is the most common way to raise the pH of acidic soils. Lime is available in the form of pure calcium carbonate or ground dolomitic limestone. Soil amendments like these should be added to the soil in early spring, before you put tomato plants in the ground.
Simply so, do tomatoes like acidic soil?
Tomatoes like their soil pH around 6.0 to 6.8. Briefly, pH is a measure of soil acidity or alkalinity. On the pH scale, 7.0 is neutral; so the range which tomatoes prefer is slightly on the acid side. (By the way, that's the pH range at which most vegetables grow best.)
Loam and sandy loam soils are best for tomato production, but these plants will grow in almost all soil types except heavy clay. If you your soil has lots of clay, you can improve the texture by tilling the soil and incorporating sand, sawdust, peat moss or other amendments before planting.