Q: If your running water has a lead concentration of more than 15 g/L, you may want to get a point-of-use treatment solution. There are many different options, but a reverse osmosis device is usually the most effective point-of-use treatment solution. However, it is also relatively expensive to purchase and operate. Reverse osmosis devices are usually installed under the sink and use tiny membranes to screen out harmful materials like lead. They also tend to waste water while treating it, which raises their operating cost. If you have well above 15 g/L of lead in your water, you will definitely want to consider a reverse osmosis device despite its cost. The Water Quality Association is a reliable resource for finding effective treatment products. There are several different kinds of these products if you don't need or can't afford a reverse osmosis device. There are filters that fit right over your faucet for extremely convenient use. There are distillers that separate lead from your water over time and collect the clean water in a jug. And there are under-the-sink filters. Before purchasing a distiller, make sure it is one that is approved by the Water Quality Association to remove lead from water. A regular Brita filter may not be enough to remove lead. If you want the convenience of filtering your water as soon as it comes out of the faucet, purchase a faucet filter. If you don't want to take up space in your sink with a filter, purchase a distiller. Conveniently, many distillers also act as water dispensers. This will ensure that you are using your device properly and removing as much lead from your water as possible. Be sure to follow maintenance recommendations as well. For instance, the filters in reverse osmosis devices must be replaced periodically. Your instruction manual should tell you how often your model's filter needs to be changed. For filters that fit over your faucet, you will usually have to run cold water through the filter for 5 minutes the first time you use it.
A: Use a reverse osmosis device for best results. Use a distiller or filter for a more cost effective solution. Follow the device's instructions when setting it up and using it.

Q: Prepare a baking sheet by greasing it with nonstick cooking spray or butter. For this step, you could line the sheet with parchment paper, instead, if you would prefer an easier clean-up. The slices should be about 1/2 inch (1.25 cm) thick. Add butter to both sides and arrange them on your prepared baking sheet. You will end up using roughly half of the butter, or 1/4 cup (60 ml), for this step. Bolillo rolls are a type of Mexican bread available through many market bakeries. If you cannot find bolillo, though, French bread makes an excellent substitution. Both types of bread have crusty outsides and soft insides. For best results, use bread that has been left out or bread that is at least 2 days old. This bread is already somewhat stale, but for a recipe like this, a little extra crispiness is actually preferable. When ready, both sides should be dry and lightly browned. Remove the rolls from the baking sheet and let cool. Set aside. Turn the rolls after 3 minutes using tongs. Work carefully to avoid getting burned. Toasting the bread in the oven is the contemporary way to prepare the bread, but a more traditional way to prepare it would be by frying it on the stovetop in a cast iron skillet. Melt 1 to 3 Tbsp (15 to 45 ml) of butter in the skillet over medium heat. Make sure that the butter coats the entire bottom of the skillet. Butter both sides of the each slice of bread, as with the oven-toasted method. Add the pieces of bread to the skillet a few at a time. Do not overcrowd the pan. After 3 minutes or so, use a spatula to flip the bread over to the other side. The side that initially faced the pan should be crispy and lightly browned. Give the other side an additional 2 to 3 minutes to cook. When done, that side, too, should be crispy and lightly browned. Note that you may need to add more butter as you go along to keep the bottom of the skillet well-coated.
A:
Preheat the oven to 350 degrees Fahrenheit (180 degrees Celsius). Cut the rolls into thin slices. Bake the rolls for 3 minutes per side. Alternatively, fry the bread.